Permanent tooth not coming in: when delay is still normal

Parents search “permanent tooth not coming in” after a baby tooth falls out and nothing replaces it for weeks, or after a classmate already shows adult incisors while their child does not. Some of those stories sit inside a normal mixed-dentition range. Some hide lost space, a spare tooth bud, old trauma, an ankylosed baby tooth, or a missing successor. I am Dr. Maksut Behruzoglu, a specialist orthodontist in Dubai; at pediatric consultation I treat the complaint as a screen: compare sides, check the bud on a film when indicated, and name a basket — observation / space / early phase / full course later. The American Association of Orthodontists (AAO) recommends a first orthodontic check no later than age 7. The Royal College of Surgeons of England 2022 guidance on unerupted upper incisors flags a contralateral tooth that erupted more than six months earlier, upper incisors still missing more than a year after the lowers, and a broken eruption sequence. I do not diagnose from one messenger photo. Below — when an empty socket is still a stage, which signals call for an exam, and how early intervention meets children’s braces.

Timing varies more than a class photo suggests

Families compare children by year group and by the holiday album. At seven, the neighbour already has upper permanent incisors; your child still has baby ones, and a chat says you are late. I see that plot every week in Dubai. The AAO asks for a first visit by seven because many children already have first permanent molars and incisors, so a doctor can see the road for the buds. The visit answers whether this child still lives in a normal corridor, or whether the corridor is already closing. An empty socket after a baby tooth can be a stage if the bud is present and space is held. The same socket can become a trap if a neighbour has already drifted. Below — three home comparisons that scramble families, unpacked without a diagnosis from a phone photo.

A classmate already has adult teeth

Passport age in one Dubai class hides different biological ages of teeth. Girls, on average, run a little earlier than boys. Family timing matters: if parents shed late, the child often walks the same corridor. I ask about mum, dad, and older siblings. Comparing with a classmate from another continent helps even less: families arrive with calendars from the UK, India, Russia, and each treats theirs as the rule. Comparing the two sides of one mouth, plus a film of the buds, tells more.

Left versus right

The matching tooth is the better clock. If the left upper incisor erupted in March and the right is empty in September with a dead-still baby tooth, I do not soothe with “wait until summer.” RCS England 2022 uses a threshold around six months versus the contralateral incisor. Canines and premolars have a wider corridor, yet asymmetry still calls for a film rather than a family-chat argument. I ask for dates: when the baby tooth left, when you noticed the gap, when a neighbour in the arch drifted.

Baby-tooth time and permanent-tooth time are different clocks

A baby tooth can leave early because of decay or trauma while the permanent tooth is not ready. The socket stays empty for months, and that can be expected if the bud is present and space is held. The reverse picture: a baby tooth sits far past the average shedding age while the permanent tooth is already pushing the root or travelling beside it. “Baby teeth fall out anyway” is a weak line here. I check mobility, the bud, and the path. You cannot fold both clocks into one folk date of “everyone at seven.”

Average eruption ages: a map I use in the chair

Textbook charts show intervals, not a verdict. Classic American Academy of Pediatric Dentistry (AAPD) windows still lean on Logan and Kronfeld and often treat about plus or minus a year as a working range for many teeth; second molars and second premolars spread wider in real mouths. Population papers from 2024–2025 confirm that medians shift by sex and group, and that upper and lower sequences differ. I put the chart on the table as a map. A child can sit outside the mean and stay healthy. A child can sit inside the mean and still have a blocked incisor because of a spare bud. The numbers below are typical windows for the crown appearing in the mouth, the ones I use at pediatric consultation in Dubai. They do not replace an exam. If a permanent tooth is not coming in relative to its pair or relative to sequence, the chart is exactly what sends us to a film.

I give parents three reading rules. First: lowers usually beat uppers for incisors. Second: first permanent molars do not replace a baby tooth — they erupt behind the baby row, and families miss them until it hurts. Third: the upper canine travels for years and likes to hide. AAPD reminds clinicians to feel for the permanent canine bulge late in mixed dentition: no bulge, no mobility of the baby canine, a palatal bump — refer before age 12 rather than “wait for braces at fifteen.” In Dubai I often see the reverse: the family waited for “all adult teeth,” and the canine already lies across the lateral incisor root.

One more chart error: waiting for the mean age after a baby tooth was already lost early. Decay and trauma in mobile families take molars before their time. After a move, notes vanish, nobody placed a maintainer, and by ten the premolar has nowhere to erupt. The chart then lies the other way: the passport says “still early,” and the corridor is already closed. Bring extraction dates and old films if you have them.

What I check when a permanent tooth is not coming in

At pediatric consultation I move from the complaint to the mechanism. A parent says “permanent tooth not coming in” — I pin down which tooth, how many months of empty space, pain, trauma, pulp treatment of the baby tooth, and whether a neighbour left early. Then face, breathing, habitual bite, hygiene, mobility of baby teeth, palpation of bulges. Films when indicated: a panoramic shows buds and extra teeth; a periapical shows one root and a local block; a 3D scan when two dimensions cannot decide whether to uncover or to pull. Not every visit needs a full imaging pack the same day. Below — three layers of one visit: home, chair, film. The layers build one story from which I name a basket and a review date, not an appliance from an ad.

What you notice at home

The home eye catches a hole in the school photo, a “second row,” a baby tooth that does not wiggle under the tongue, “hard to bite an apple,” swelling or a gum boil by a baby root. Two or three smile photos across a year and a short timeline help: lost / not lost / white tip appeared / vanished. For front-tooth trauma — date of the fall, whether the baby tooth was displaced, whether a film was taken then. Families after a move often cannot recall if a molar was extracted “still in London” and whether a ring was placed. That memory saves an extra film and an extra month of waiting.

What I check in the chair

I compare sides, probe whether a path exists through the gum, feel for the permanent bulge, watch for a baby molar that has “sunk” (ankylosis), and check whether the first permanent molar is jammed under the baby second molar. I watch hygiene: heavy plaque and decay change priority — clean and restore first, then orthodontics. I watch the bite: a crossbite and a jaw shift can close the road for a tooth that “will not grow.” I ask the child to close “as you chew,” not “straight for the camera.” A forced shift at home and a square photo for the ID card are different pictures.

When a film belongs on the same visit

A panoramic almost always fits asymmetry of several months, a broken sequence, a missing canine bulge, a history of front trauma, or early molar loss without a clear plan. I add a periapical when I need one root or a spare bud in the incisor zone. I do not order CBCT “for a pretty 3D for everyone.” Its logic comes after the 2D picture, when the decision (remove a supernumerary, uncover an unerupted tooth, traction a canine) changes with three-plane position. I explain dose before exposure. I ask for films from home: I dislike repeating the same panoramic “just in case.”

Why a permanent tooth gets stuck

The mechanics sound simple and feel different in the chair. A permanent tooth travels a path prepared by the baby root, space in the arch, and the absence of a block. Break any of the three and the crown stays in bone or exits in the wrong place. I group causes so a parent hears a task, not a Latin list.

Space. Neighbours drifted after early baby-tooth loss. The arch is narrow, incisors fan, the permanent incisor has nowhere to stand. The first permanent molar tipped forward and stole the premolar corridor. Here a space maintainer, space recovery, or expansion inside early intervention often does the job. I do not promise “the jaw will grow and space will appear” without a film: growth happens, yet a closed corridor does not reopen from the calendar alone.

A block. A spare bud (supernumerary, often in the upper incisor zone) is the most frequent local reason an upper central stays in, according to RCS England 2022. Odontome, cyst, scarred gum after trauma, a baby tooth whose root will not resorb — especially after pulpotomy. Upper incisors are vulnerable in mixed dentition at seven to nine, which is exactly when families type “front permanent tooth not coming in.”

Trauma. A blow to a baby incisor at three to five can bend the permanent bud (dilaceration). The tooth then lies in bone like a hook and will not erupt even if space exists. I ask about scooter falls, pool edges, swings. In Dubai that list is long. An old film after the injury helps; families often no longer have it.

Ankylosis of a baby tooth. The tooth fuses to bone, will not shed, and “sinks” relative to neighbours that keep erupting. Baby molars are the usual site; in the permanent dentition ankylosis more often follows luxation. Pediatric reviews put baby-tooth ankylosis around 7–14% of children — not a rare-chair event. The premolar underneath can deflect or stall.

No bud. Missing laterals, second premolars, sometimes other teeth. The baby tooth then “will not fall” because nothing is coming. The plan changes: keep the baby tooth if root and crown allow, or close the gap later with orthodontics, or hold space for a future replacement. That decision follows a film and a face conversation, not the fear of “a hole forever.”

Rare systemic issues and primary failure of eruption. If a group of teeth will not erupt, if the family history is heavy, if bone or metabolic disease is in the notes, I do not close with “wait.” I involve the paediatrician and an oral-surgery colleague when indicated. Primary failure of eruption (PFE) is uncommon: the tooth does not answer orthodontic traction the way we expect. I do not set that label from one Instagram frame. I mention it so a parent does not drag the child through another year of “tighten the wire again” if the mechanism is different.

Ectopic first molars. Up to about three percent of children, more often upper six-year molars: the molar jams into the distal of the baby second molar, wears it, and fails to stand in the row. Parents still describe a permanent tooth not coming in, even though the tooth is trying. We catch it on bite and film at six to seven. Late catch costs more than early.

I name the cause in one sentence before a plan: “extra bud above the incisor,” “no space after early extraction,” “baby tooth fused,” “no bud,” “canine in the palate.” Until that sentence exists, no appliance exists. Ads that promise “fix in a month without a film” skip this step.

Reasons to book in the next weeks

Waiting is a legitimate tool. Open-ended waiting without a date and without a film is a school-chat trap. I separate “the corridor is still wide” from “the corridor is closing.” The AAO says: if something looks off before seven, you do not wait for the birthday. If the child is already nine or ten and has never had a screen, that is also not “late forever.” Below — three signals for which I ask you not to push the booking to a break six months away. They are not a diagnosis. They are a right to clarity. In Dubai, holidays and flights stretch “one more month” into a year; I put the review date in the family calendar, not into a vague “sometime in autumn.”

The matching tooth is in; this one has been silent for months

For upper incisors, RCS points to about six months versus the contralateral and about a year versus the lower incisors. I do not ask a parent to memorise the numbers. I ask: if one side of the smile is already “adult” and the other is empty for a whole school year — come in. Canines run on a different clock, with the same side-to-side rule. A straight-on photo every three months helps memory.

The eruption order is broken

Laterals are in; centrals are not. A canine is in; the neighbouring incisor is still a dead baby tooth. A premolar popped; the six-year molar never stood. Upper sequence is usually molar — central — lateral — first premolar — canine — second premolar — second molar; lower — central and molar, then lateral, canine, premolars, second molar. Local variation exists. A crude break in order is a reason to see the buds, not a reason to argue “it runs in our family.”

The baby tooth is stone-still, a neighbour is already in, or a second row is forming

No mobility, a “stone” percussion note, a tooth sitting below its chewing neighbours — I think ankylosis or a permanent tooth travelling beside the root. A second row of lower incisors (so-called shark teeth) is a frequent separate plot: the permanent tooth erupted on the tongue side while the baby tooth still holds. Some of those cases settle when the baby tooth finally leaves; some need the baby tooth out. I unpack that on exam, not from a panic selfie. Pain, swelling, a gum boil, fever — that is dental urgency; the orthodontic calendar can wait a day.

Panoramic and 3D films: what they answer and what they cannot

A film answers questions a finger and a mirror leave open: is there a bud, does it lie in bone, is there an extra tooth, is a neighbour’s root being worn, has a molar sunk. A panoramic (OPG) surveys both jaws. I tell the child it is a photograph “like airport security, for teeth,” and I stand with them. A periapical is sharper for one root. An occlusal film sometimes helps in the incisor zone. CBCT gives three planes when surgery or traction depends on position.

A film leaves these jobs to the exam. It does not set a plan without examining bite and face. It does not say “bond braces tomorrow.” It does not replace a hygiene talk: uncovering an unerupted tooth into a dirty mouth is a poor trade. It does not cancel review in months: a bud that sits “still high” today may move or may jam.

Families bring discs from several countries. I read what exists and add only the gap. Repeating a full pack “because this clinic’s protocol” without a clinical question is a habit I refuse. If a film is old and the clinic picture has changed, we decide by date and by complaint. Ask dose questions out loud: I answer before the button, not after.

A separate fear: “we are afraid of X-rays, let’s wait.” Waiting without a picture when incisors are asymmetric is how a spare bud sits for years while the central loses its path. A reasonable indicated film in mixed dentition is part of an AAO-style screen, not “radiation for a report.”

Watch, hold space, early phase, children’s braces

Once the cause is clear, the plan sounds like a basket, not an appliance brand. I name the basket aloud and write the next step. A Dubai family flies for the summer — we decide early whether return can wait or a step is needed before the airport. The child should hear the task in their own words: “we watch,” “we hold the road,” “we remove the block,” “we align the row later.” The adult carries the same sentence into the calendar and the nanny chat. Below — four baskets I put on the table when a permanent tooth is not coming in. They can run in sequence: space first, then watch, then a full course. They can remain one date. Ads that sell a plate for every seven-year-old, or waiting until sixteen for everyone, skip this fork.

Watch with a date

The bud is present, the path is clear, space exists, asymmetry still sits in the corridor. I set a review — often three to six months — and ask for photos if the family flies. Watch without a date becomes “sometime after the holidays,” and holidays eat a year. At review we compare sides, mobility, and a film if needed. If the picture is stable, we extend. If the bud rotated or a neighbour closed the gap, we change baskets.

Space: hold it or get it back

After early loss of a baby molar, neighbours like to drive into the empty lot. A space maintainer is a dull, strong tool. Recovering space already lost is harder: sometimes limited appliances, sometimes expansion. That is early intervention territory, not “time for every bracket.” I give the child one sentence: “we are keeping a road for a tooth still in the bone.” Without that sentence a ring on a tooth feels like punishment.

Early intervention

A narrow job for months: remove a block (supernumerary, ankylosed baby tooth), open a path, place traction on an unerupted incisor or canine, expand a narrow palate, catch an ectopic molar. The AAO describes two-phase care as an option when an early phase lowers the risk of damage to permanent teeth or a severe deformity; it is not a duty for every child. After an early phase there is often a growth pause, then a full course. I say the pause before we start, or the family expects a “forever-straight smile” from one ring.

A full course later

Children’s braces and a teen full course make sense when most permanent teeth are in or ready, and the job is to build an arch rather than cut a road for one tooth. Bonding an entire system at seven “while the tooth has not come in” is rare and narrow in my chair. More often: road first, row later. If a canine sits in the palate and the incisors are already in the arch, the plan may mix surgery, traction, and a few brackets, with a full course after. Time and hardware depend on the case; I do not guarantee “it will erupt by September.”

Dubai families: school, flights, changing dentists

Dubai life breaks orthodontic calendars harder than a textbook. A school year with home-country holidays, a nanny who was not at the visit, a dentist change after a move, films on a USB from three countries, a class chat that says “we all wait until twelve.” I fit the plan to that, rather than arguing with an Emirates timetable.

School. ID photos and concert smiles press harder than an eruption chart. I understand that and still do not place an appliance for a photo if the bud is still high and the path is open. The reverse also holds: a hole in the smile with a spare bud above it is a reason not to wait for graduation. School notes I write from the visit, not “just in case for a month ahead.”

Flights. If departure is in two weeks and a film shows a supernumerary above an incisor, I split honestly: what we can do here (film, plan, sometimes baby-tooth removal), what to coordinate with a surgeon after return, what is unsafe to leave “with grandparents all summer with no clinic address.” A number for breakage photos and the rule “sharp edge — wax, not pliers” go out before the airport.

Changing doctors. Bring notes, extraction dates, old panoramics. I do not scold a previous plan in absentia. I build a new picture. If a maintainer was removed “because it annoyed” and the premolar is still in bone, we repair the task, not a reputation. A referral from a general dentist is not required in the UAE: you can bring the child for an orthodontic screen yourself when a permanent tooth is not coming in and the chart no longer soothes.

Expat families compare with home-country habits: some wait for “all adult teeth,” some take a panoramic for every seven-year-old as ritual. I lean on the complaint, the sides, growth, and a film when indicated. A second opinion is welcome. AED figures, if cost comes up, I name after a plan with a price-list date; UAE insurance covers orthodontics differently — the policy administrator confirms cover; I do not invent tariff lines.

If fear lands at night after the visit — “we will miss the window” — the answer is criteria and a review date. I slow an impulse to “extract every baby tooth tomorrow” without new information. I also slow “let’s wait, it will sort itself” when incisor asymmetry has already eaten a school term.

FAQ

How long can we wait if the baby tooth is gone and the permanent tooth is not coming in?

The corridor depends on the tooth and the matching side. For an upper incisor, think months, not years: the pair has been in more than six months, or the lowers erupted more than a year ago — book. For a premolar under held space, waiting is longer. Exam and film set the term, not the class chat.

Does a child under seven need a film?

Yes, if there is asymmetry, trauma, early extraction, a gum boil, a stone-still baby tooth, or a broken sequence. Age 7 is an AAO screening landmark, not a ban on earlier films. I order a film for a clinical question, not “every five-year-old as routine.”

Can the tooth still erupt on its own if the film shows a bud?

Yes, if the path is clear and space exists. A bud on a panoramic is not a calendar date. Dated review exists for this: we see movement — we wait; we see a turn or a block — we change the plan.

The baby tooth will not fall even though “it is time.” Is that always a problem?

No: the permanent tooth may still sit high, there may be no bud so the baby tooth works for years, or the baby tooth is fused / after pulp treatment will not resorb and blocks the successor. Exam separates those. I ask families not to yank a baby tooth at home with thread “because the chart says now.”

Is this an impacted tooth? Should we start braces at once?

Retention means a tooth that missed its time and will not come in without help, or will come in in the wrong place. Full-arch braces at seven because of one stuck incisor are rare in my chair. More often we remove a block, open a path, sometimes traction one tooth, and save a full course for later. Exam decides.

The first molar is “not growing,” yet all baby teeth are still there. Is that normal?

The first permanent molar does not replace a baby tooth: it stands behind the baby row at six to seven. Parents do not wait for it in a socket after shedding. If the six-year molar has not appeared and the other side already has one, or the baby tooth behind is being undercut — come in. Ectopic molars are cheaper to catch early.

Can a WhatsApp photo tell us “normal or orthodontist”?

No. A photo helps decide how soon to travel and shows a second row or a hole. Diagnosis and the plan basket need an exam, often with a film. I read sent frames as a booking filter, not as a remote treatment plan.

Paediatric dentist or orthodontist in Dubai?

Decay and a gum boil go to a dentist, sometimes the same day. The question “permanent tooth not coming in, space, bud, canine, second row” is an orthodontic screen. You can book pediatric consultation yourself. If a paediatric dentist is already involved, bring their films: two views of one panoramic beat an argument over “whose patient.”