What is IPR for teeth, and is it safe?
IPR, or interproximal reduction, is the careful removal of a very thin layer of enamel from the sides of teeth where they touch, to create space for straightening with braces or aligners. The amount is planned in advance and the surfaces are polished afterwards. A systematic review found no increase in cavities on treated surfaces up to seven years later. At Creative Arts in Dubai our specialist orthodontists explain in writing where and why any IPR is planned.
Who treats you here Dr. Muhannad Kazzaz Specialist Orthodontist · Dr. Valeriia Kozachenko Specialist Orthodontist
Every dentist’s licence can be checked on the DHA Sheryan medical directory.
What is IPR teeth shaving, and why would an orthodontist suggest it?
Interproximal reduction goes by many names: IPR, stripping, slenderising, enamel reduction or, more alarmingly, "teeth shaving". All describe the same thing: removing a very small amount of enamel from the contact points between neighbouring teeth. The outer shape of the tooth and its biting edge are not changed, and the slice taken is planned so that it stays within the enamel layer.
Orthodontists use IPR for a few specific reasons:
- To make space for mild to moderate crowding, so teeth can be lined up without pushing them forwards or removing a tooth.
- To correct a size mismatch between upper and lower teeth, which otherwise stops the front teeth from fitting together neatly at the end.
- To reshape triangular teeth, which helps reduce the small dark gaps near the gum line known as black triangles.
- To help stability, because broad, flat contact areas between lower front teeth are thought to hold their position better than point contacts.
IPR is common in clear aligner plans, because the space it creates is built into the digital treatment simulation from the start, but it is also used with fixed braces.
IPR vs extractions vs expansion: how is space made for crowded teeth?
Crowded teeth need space to straighten. These are the main ways orthodontists create it; many plans combine more than one.
| Approach | How it creates space | Typically suits | Trade-offs |
|---|---|---|---|
| IPR (interproximal reduction) | A thin slice of enamel from several contact points adds up to useful space | Mild to moderate crowding; triangular teeth; size mismatch | Limited amount of space; removes a little enamel permanently |
| Arch expansion | Widening the arch, mainly at the sides | Narrow arches, some crossbites | Only possible within the limits of bone and gums; may need retention long term |
| Moving front teeth forwards | Tipping incisors forwards lengthens the arch | Mild crowding with upright front teeth | Can make lips look fuller; limited by gums and bone |
| Moving back teeth backwards | Molars moved back to free space in front | Selected cases, often with elastics or anchorage | Slower; depends on space behind the molars |
| Extractions | Removing a tooth, usually a premolar, on each side | Severe crowding or marked protrusion | Irreversible; longer treatment; space must be fully closed |
Which approach suits you depends on how much space is needed, your gums and bone, your bite and your facial profile. It is decided at examination, not from photos.
Does IPR damage enamel or cause cavities?
This is the most common worry, and it is a fair one: enamel does not grow back. The key points are how much is removed and how the surface is finished.
The amount removed per contact is small and stays within the enamel layer; it is measured with gauges as the work goes on. The surfaces are then polished, and a fluoride product may be applied. On the question of decay, a systematic review in Orthodontics & Craniofacial Research pooled studies following treated teeth and found no statistically significant difference in cavities between surfaces that had IPR and untreated surfaces from one to seven years later; the authors concluded IPR does not increase caries risk. The same review noted that firm conclusions about how rough the enamel remains could not be drawn, which is why careful polishing matters.
Your part is the same as for any orthodontic patient: clean between the teeth daily, keep sugary and acidic drinks to mealtimes, and keep your check-ups. A higher personal risk of decay, or existing cavities between the teeth, are reasons to treat those first and to rethink how much IPR is used.
Does IPR hurt?
Most people describe IPR as strange rather than painful. Enamel has no nerves, so removing a thin layer from its surface is not usually felt as pain and normally needs no injection. What you notice is vibration, pressure between the teeth, a gritty feeling and the sound of the strip or disc. The gums between the teeth can feel tender for a day if they were touched.
Some people notice mild sensitivity to cold for a short time afterwards; it usually settles quickly. After IPR, small gaps may be visible between some teeth. That is expected: they are the space the plan will use, and they close as the teeth move over the following weeks. Comfort during aligner treatment more broadly is covered in does Invisalign hurt?
How is IPR done?
A typical sequence. Timing depends on the plan; IPR is often done in stages when teeth have moved enough to reach the contact.
Check the plan and the teeth
The orthodontist confirms where IPR is planned and how much, and checks for decay or fillings at those contacts using the examination and X-rays where needed.
Protect and separate
The gums and lips are protected. A thin separator or strip may be used to open the contact slightly.
Reduce the contact
Fine abrasive strips, thin discs or a fine bur remove a thin layer of enamel from the planned surfaces.
Measure
A thickness gauge is passed between the teeth to confirm the space matches the plan, so no more is removed than needed.
Polish and protect
The surfaces are smoothed and polished, and fluoride may be applied. You then continue with your braces or next aligner.
IPR vs extractions for crowding: which is better?
They solve different sizes of problem. IPR spread over several teeth can provide a modest amount of space, enough for mild to moderate crowding. Severe crowding, or front teeth that stick out markedly, may need more space than IPR can safely give, and that is where extractions come into the discussion.
Research comparing extraction and non-extraction treatment has found that removing four premolars tends to bring the lips back slightly, that non-extraction treatment was shorter, and that there was no significant difference in how attractive the smile looked afterwards, although the evidence is of very low quality. So the decision is less about which method is "better" and more about how much space your teeth need, and how your profile and lips will look once the teeth are aligned. Our guide to extractions for braces explains that side of the decision, and do braces change your face? covers how tooth movement affects the lips.
IPR is planned, not improvised
You should know before treatment starts whether IPR is part of your plan, which teeth are involved and roughly how much. With aligners, it is shown in the treatment simulation. If it is not mentioned, ask; if you are uncomfortable with it, ask what the alternatives are.
When is IPR not a good idea?
IPR suits many crowded smiles, but not every mouth. Orthodontists are cautious or avoid it when:
- there is active decay or a high risk of decay that is not yet under control;
- the teeth are already small, or the enamel is thin or worn;
- there is gum inflammation that needs treating first;
- the space needed is larger than IPR can provide safely;
- the teeth involved have large fillings at the contact, where reshaping the filling may be considered instead.
IPR is also different from cosmetic tooth reshaping, which smooths visible edges and corners to improve how teeth look rather than making space for movement.
Have an aligner or braces plan that includes IPR and want to understand it? Our specialist orthodontists in Dubai examine your teeth and explain where space comes from, in writing, before anything starts.
Explore orthodonticsHow is IPR planned at Creative Arts?
At Creative Arts, orthodontic treatment is planned by our specialist orthodontists, Dr. Muhannad Kazzaz and Dr. Valeriia Kozachenko, from an examination, X-rays where needed and an intraoral 3D scan. For aligner treatment, the scan is used to build a digital plan that shows each stage of movement, including where small attachments sit and whether any IPR is planned. The written plan explains how space is being created and the alternatives, so you can ask questions before any enamel is touched.
If you are comparing aligner plans of different lengths, our guide to Invisalign Lite vs Comprehensive explains why the scope of a case matters more than the package name, and Invisalign attachments explains the other small additions to the teeth you may see in a plan.