Bonding for gaps and chipped teeth: what composite can do, and what a photograph cannot tell you

Two jobs account for most of what people mean when they ask about bonding: closing the gap between the front teeth, and rebuilding a corner that has chipped off. Both are done with composite resin, added to the tooth and shaped by hand. Neither has a fee-schedule line of its own — bonding is billed as a composite restoration, priced by how many surfaces of the tooth the material covers.

Whether either is suitable for your teeth is a clinical question, and this page does not attempt it. What it can do is explain what the two jobs ask of the tooth, what the published schedules allow for them, and why so much of the material online about them is built on photographs that prove very little.

Closing a gap adds material to both sides

A gap between two front teeth is not closed by filling the space. It is closed by widening the two teeth either side of it, adding composite to the facing edge of each until they meet. That has consequences worth understanding before you agree: both teeth change shape, the added material sits where floss has to pass, and the result is two slightly wider teeth rather than the same teeth moved together.

In billing terms that is two restorations, not one — a separate line for each tooth. Each is priced on its own surface count, and since the facing surface and usually the front surface are both involved, a two-surface line is the common minimum. On the three schedules read here, a two-surface composite on a front tooth is allowed $60.00 in Pennsylvania, $118.56 in Montana and $140.00 in Washington; doubled for two teeth, that is the published floor for closing one gap.

Those are payer allowances and not private fees, and a gap closed purely for appearance is the clearest example of work a restorative payer may not fund at all. The detail on how composite is priced is set out in what dental bonding costs.

A chipped corner is a repair, and repairs are graded by how much is missing

A chip is different. Here the composite is replacing tooth that has broken away, and the schedules grade it by how far the repair extends. A small nick on the front face is one surface. A corner that has gone, taking part of the biting edge with it, is the line the schedules describe as four or more surfaces or involving the incisal angle — the top of the front-tooth range, allowed $65.00 in Pennsylvania, $158.08 in Montana and $212.00 in Washington.

There is a further line above that on all three. Where so much of a front tooth is gone that composite is built up into a full cover rather than a patch, the schedules move to a composite crown line: $150.00 in Pennsylvania, $151.00 in Washington and $268.74 in Montana. Pennsylvania restricts that line to patients under 21. The step from repair to cover is the one that changes the conversation, and it is the same step that eventually leads to a crown and what it costs.

Why identical work is sometimes funded and sometimes not

A chipped tooth repaired because it has broken is restorative. A sound tooth reshaped because you do not like its shape is cosmetic. The composite is the same, the appointment looks the same, and payers treat the two completely differently. The ADA notes that composites "occasionally are not covered by some insurance plans" even when they are fillings; for appearance alone, the reasonable starting assumption is that nothing is covered.

This is why the reason written on your treatment plan matters as much as the procedure. It is fair to ask a practice how the work will be coded and whether it expects it to be funded — and to get the answer before the appointment rather than at the desk afterwards.

About before-and-after photographs

There are none on this site. We publish no clinical photographs, no patient pictures and no simulated results, because a photograph of somebody else's teeth tells you nothing reliable about yours and a pair of them can be made to tell you almost anything. That is not a criticism of any particular practice; it is a description of what the format can and cannot carry.

If you are looking at a practice's gallery anyway — and most people do — these are the things worth noticing:

• Lighting and angle. A "before" shot in flat overhead light and an "after" shot in warm directional light will differ in apparent colour whatever happened in between. Compare pairs shot the same way, or treat the pair as decorative.
• How long after. A composite restoration on the day it is placed is at its most polished. A photograph taken immediately is a picture of the best it will look, not of how it settles.
• Whether the same procedure is being shown. Galleries often mix bonding, veneers, crowns and whitening under one heading. Those are different procedures with very different prices and very different amounts of tooth removed.
• Whose teeth they are. The United States Federal Trade Commission's Rule on the Use of Consumer Reviews and Testimonials, 16 CFR Part 465, took effect on 21 October 2024 and prohibits selling or purchasing fake consumer reviews or testimonials. That tells you a practice has an obligation; it does not tell you any particular image is genuine.

The thing a gallery genuinely cannot show is the part of the decision that matters most: how much tooth was removed, what was underneath, and what the plan is when the restoration eventually needs redoing. Those live in a written treatment plan, which is the document worth asking for. The same reasoning applies to bridge galleries, covered in bridge before and after.