Chalky white marks left behind after braces are one of the most common reasons people ask about resin infiltration. The technique, best known by the product name Icon, lets a very runny resin soak into the porous enamel of a white spot. Once the pores are filled, light passes through that area much as it does through healthy enamel, so the mark becomes far less noticeable. No drilling or injection is usually needed.
It is not right for every white mark, though. Whether it helps depends on what caused the spot and how deep it goes.
Why white spots look white
A white spot is an area of enamel that has lost mineral and become full of tiny pores. Those pores fill with air or water, which bend light differently from sound enamel, so the area looks opaque and chalky. Common causes include mineral loss around brackets during braces, fluorosis from taking in too much fluoride while the teeth were forming, developmental enamel defects, and the earliest stage of decay before a hole forms.
The cause matters because it changes the treatment. Our guide to white spots on teeth explains how a dentist tells them apart.
Filling the pores changes how light behaves
Enamel over a white spot usually has a harder, more mineralised surface layer sitting on top of a porous zone. Resin cannot get past that surface layer on its own, so it is first softened with an acid gel. The tooth is then dried, and the infiltrating resin is applied and left to soak in before being set with a curing light.
Laboratory work shows the resin can reach deep into early lesions. In a study of extracted teeth (Meyer-Lueckel and colleagues, Journal of Dentistry, 2011), the resin penetrated a median of about 0.4 mm into natural enamel decay when left for three minutes, filling almost the whole lesion. Because the resin sits inside the enamel rather than on top of it, the tooth keeps its natural shape and surface.
What happens at the appointment
- The gum is protected with a rubber dam or barrier, and the teeth are cleaned.
- An acid gel is applied to open up the surface layer, then rinsed off.
- The tooth is dried with an alcohol solution. This also gives a preview: if the spot fades while wet with alcohol, infiltration is likely to help. If not, the etch step can be repeated.
- The resin is applied, allowed to soak in and light-cured, usually in two layers.
- The surface is polished.
Treatment is usually done in a single visit. Most people need no anaesthetic, and many say the barrier on the gum is the main thing they notice.
The research on masking white spots
A 2021 systematic review and meta-analysis in Clinical Oral Investigations (Bourouni and colleagues) pooled 11 studies covering 1,834 teeth. White spots treated with resin infiltration showed significantly greater masking than untreated spots or spots treated with fluoride varnish. The authors rated the evidence as moderate but noted it rests on a small number of well-run trials. For fluorosis, bleaching before infiltration made no difference to how well the spots were masked.
Long-term data are more limited. A small follow-up of teenagers treated for white marks after braces (Knösel and colleagues, Angle Orthodontist, 2019) found the improvement in colour was largely maintained at an average of nearly three years, although only eight of the original patients could be followed up.
Where it works best, and where it may not
Resin infiltration tends to suit shallow white spots, such as marks left after braces and mild fluorosis. It is less predictable for very deep spots, brown or yellow staining, marks with a broken surface, or a cavity. In those situations a dentist may discuss enamel microabrasion, whitening, composite bonding or veneers instead.
| Option | How it deals with the mark | Tooth structure removed |
|---|---|---|
| Resin infiltration | Fills the porous enamel so it blends in | None beyond a light surface etch |
| Microabrasion | Polishes away a thin surface layer of stained enamel | A very small amount |
| Composite bonding | Covers the mark with tooth-coloured resin | Little or none |
| Porcelain veneer | Covers the front surface of the tooth | Usually some enamel |
For comparison, typical market ranges are $250 to $800 per tooth for composite bonding and $1,500 to $2,500 per tooth for porcelain veneers. These are typical market ranges, not Lumi fees. Costs for infiltration and microabrasion vary with the number of teeth treated, so ask for a written treatment plan with fees after an examination. You can also see our current offers.
Questions patients ask
Will it whiten the rest of my teeth?
No. It targets individual white marks and does not change the overall shade. If you would like lighter teeth as well, whitening is often done first, and any marks still visible are treated afterwards. Our article on in-chair and take-home whitening explains the options.
Is it suitable for teenagers after braces?
Often, yes, once the braces are off and the gums have settled. The dentist will first make sure the marks are stable rather than active decay, and good brushing with fluoride toothpaste remains important.
What if the white spot is early decay?
Early decay without a hole can sometimes be infiltrated to help stop it progressing, but this needs careful assessment and regular review. A spot that has already formed a cavity needs a filling instead.
What if the result is not enough?
Because no healthy enamel is cut away, other options such as microabrasion or bonding remain open if a mark is still visible or the area changes over time.
Find out what suits your white spots
If white marks bother you, a free cosmetic consult is a good place to start. A dentist can look at the cause and depth of the spots, explain which approaches are likely to help, and you will usually receive a written plan afterwards, often by email.
