One Front Tooth Came Through. The Other Never Did.

Quick answer: When one permanent front tooth has erupted and its twin has not appeared within about six months, something is blocking it. The most common obstruction is an extra tooth buried in the bone, and finding it early is what determines whether the front tooth can be saved.

The call

The asymmetry was what worried her — one adult front tooth down, a gap beside it, and a year of nothing happening.

A mother in Mishkafayim brought her eight-year-old, Naftali, who had lost both upper front baby teeth around the same time. The left permanent incisor had come through normally. The right space had stayed empty for fourteen months.

School photographs had made it obvious. She had been told twice it was normal variation.

What we found

An empty space on the upper right with the gum firm and slightly bulging, and the left central incisor fully erupted and starting to drift into the space.

The rule that should trigger investigation, and which had been missed: if one tooth of a pair has erupted and the other has not followed within about six months, or if a tooth is more than about a year behind its expected time, it needs an x-ray. Symmetry is the useful measure, not absolute age.

The panoramic film showed the permanent incisor present but high in the bone, angled, and unable to descend. Sitting directly in its path was an extra tooth — a supernumerary, in the midline region, cone-shaped and inverted.

A small-field cone beam scan located it precisely in three dimensions, which matters for planning the surgical approach: it lay slightly to the palatal side, which meant the incisor could be reached from that direction without disturbing the bone at the front.

Supernumerary teeth in the midline are among the more common developmental anomalies, they are more frequent in boys, and they often run in families. Most cause no problem. When they sit in the eruption path, they block the permanent tooth entirely.

Why timing matters so much. A permanent incisor retains its ability to erupt spontaneously for a limited period. Remove the obstruction early enough, with space maintained, and a substantial proportion come down on their own within a year — no traction, no bracket, no second surgery. Leave it, and the tooth's eruptive potential fades, the root finishes forming, and it has to be surgically exposed and pulled into place orthodontically over many months.

Fourteen months of waiting had already cost some of that margin. Another two years would have cost most of it.

What we did

Surgical removal of the supernumerary, under local anaesthetic with sedation, through a small palatal flap. About forty minutes.

Space maintained, which is the step most often forgotten. The left incisor had already drifted about 2mm into the space, and the permanent tooth cannot erupt into a gap that is too narrow. A simple removable appliance held and slightly regained the space.

Then we waited, which is genuinely a treatment decision and not passivity. Reviews at three, six and nine months with x-rays to track vertical movement.

At seven months the tooth had descended noticeably. At eleven months it appeared through the gum. At fourteen months it was in the arch.

No traction, no exposure surgery, no bracket bonded to a buried tooth.

Minor orthodontic alignment at twelve to finish the position, and composite to build the edge slightly where it was narrower than its twin.

The outcome

A normal-looking arch by thirteen. One surgical procedure rather than two.

Had he been x-rayed at the six-month point rather than at fourteen months, nothing would have been different — he was still inside the window. Had it been left until eleven or twelve, as happens often, the outcome would have involved exposure surgery, a gold chain bonded to the tooth, and eighteen months of traction.

What to do if this happens to you

1. Compare left with right. If one tooth has come through and its twin has not within six months, get an x-ray.
2. Do not accept "it will come" past a year. Normal variation has limits.
3. Ask for a panoramic x-ray, and a 3D scan if something is found.
4. Ask about space maintenance, not just removing the obstruction.
5. Expect a period of watchful waiting afterwards. Spontaneous eruption is the goal.
6. Act in the primary school years. The eruptive potential does not last.

One front tooth missing longer than its twin? Ramat Beit Shemesh Urgent Dental Care x-rays rather than waits. 055-985-8845 · WhatsApp https://wa.me/972559858845 · Harav Kook 28/1, Beit Shemesh

This is a composite clinical story. It reflects a presentation we see regularly in Beit Shemesh and Ramat Beit Shemesh; the name and details are illustrative and are not those of a real patient.