Resin infiltration, most often sold under the brand name Icon, is a way to mask white spots on teeth without drilling, needles or anaesthetic. The resin flows into the porous enamel of a white spot lesion and changes the way it reflects light, so the mark blends back into the surrounding tooth. Studies show the resin can penetrate up to around 450 microns into the lesion and match the refractive index of healthy enamel, which is why the white patch appears to fade rather than being covered over.
Key takeaways
- Resin infiltration masks white spots by filling porous enamel with a light-cured resin, not by removing tooth structure.
- It suits shallow, early white spots such as post-orthodontic decalcification and mild fluorosis rather than deep or brown stains.
- The whole process is usually done in one visit, without drilling or anaesthetic.
- Results can be excellent, though some colour rebound may occur over time and a top-up is occasionally needed.
- It is more conservative than veneers or crowns because no healthy enamel is cut away.
What causes white spots in the first place
White spots are areas where the enamel has lost minerals and become more porous than the tooth around it. Light scatters differently through that porous zone, so it looks chalky and white. The three most common causes are decalcification after braces (where plaque sat around brackets), dental fluorosis from too much fluoride while the teeth were forming, and the early stage of tooth decay. Our guide to white spots on teeth covers how a dentist works out which of these you have, because the cause decides the treatment.
How resin infiltration works, step by step
The appointment usually takes 30 to 60 minutes for a small group of teeth and follows a set sequence.
Step 1: Isolate and clean
A rubber dam or barrier protects the gum, and the tooth surface is cleaned and dried.
Step 2: Etch the surface layer
A hydrochloric acid gel removes the thin, highly mineralised surface layer that would otherwise block the resin. This step is repeated until the enamel is ready.
Step 3: Dry with ethanol
An ethanol drying agent shows a preview of the likely result. If the spot still looks obvious after drying, the etch step can be repeated.
Step 4: Infiltrate with resin
The low-viscosity resin is applied and left to soak into the pores, then set with a curing light. A second coat is usually applied, and the tooth is polished.
Who it suits and who it does not
Resin infiltration works best on shallow lesions where the porosity sits near the surface. It is a strong option for post-orthodontic white marks and mild fluorosis. It is less predictable for deep spots, brown discolouration or where the enamel surface has already broken down. In those cases enamel microabrasion, whitening, composite bonding or veneers may be discussed instead.
| Option | How it treats the spot | Tooth removed | Typical general cost range |
|---|---|---|---|
| Resin infiltration (Icon) | Fills porous enamel to blend colour | None | $200 to $450 per tooth |
| Microabrasion | Polishes away the top 0.2 mm | Very little | $150 to $350 per tooth |
| Composite bonding | Covers the spot with resin | Minimal | $250 to $600 per tooth |
| Porcelain veneer | Caps the front of the tooth | Some enamel | $1,300 to $2,500 per tooth |
These are general market ranges to help you compare approaches. They are not a quote. A written estimate can only be given after an examination, so it helps to see the current options on our pricing and offers page.
How long the result lasts
For many people the improvement is stable for years. Research does note that the masking effect is strongest in the first few months and that some lesions show a small colour change over time, so a touch-up is occasionally needed. Keeping plaque off the treated teeth and avoiding heavy staining habits helps the result hold. Because no enamel is removed, repeating the treatment later is straightforward.
Frequently asked questions
Does resin infiltration hurt?
It is usually painless. There is no drilling and no injection, and most people feel only the mild taste of the etch gel and the pressure of the barrier on the gum.
Can it whiten my whole smile?
No. It targets individual white spots rather than the overall shade. If you also want a brighter smile, a dentist may suggest doing whitening first, then treating any spots that remain.
Is it permanent?
The resin itself does not wash out, so the treatment is long lasting. Some colour rebound can happen over the years, which is managed with a simple top-up rather than starting again.
Can children have it?
Yes, it is often used for teenagers after braces once the teeth have fully erupted and the gums are healthy. A dentist will check that any white marks are stable rather than active decay first.
What if the spot is actually decay?
Early decay that has not formed a hole can sometimes be infiltrated to slow it down, but a dentist will assess this carefully. If there is a cavity, it needs a filling instead.
If white marks are affecting how you feel about your smile, a complimentary cosmetic consult is a good place to start. A dentist can tell you whether resin infiltration, microabrasion or another option fits your teeth, and give you a written plan with no obligation.
