Short answer: White spots in enamel are porous areas where mineral is missing. They stand out because porous enamel refracts light differently from healthy enamel. In infiltration, a thin resin is drawn into those pores — the refraction evens out and the spot recedes. No drilling, no anaesthetic, one appointment. Not every spot responds equally well, and there is no guaranteed result.
Most patients arrive with the same sentence: “The spots came after my braces and they won't go away.” Some have spent years working at them with whitening products and found that afterwards the spots were, if anything, more obvious. The reason for that also explains why infiltration works.
Why a spot looks white
Healthy enamel is dense and translucent. Where mineral has been lost, a porous network of microscopic cavities forms, filled with water and air. Light is scattered inside it instead of passing through, and we perceive that scatter as a chalky white spot. The spot is therefore not a deposit on the tooth but a change inside the tooth — which is why it cannot be brushed away or polished off.
That also explains the whitening paradox: whitening lightens the surrounding enamel, but it lightens the porous spot as well. The contrast remains, and in the short term it can even become stronger.
Where the spots come from
- After fixed braces: around the bonding points of the brackets, brushing is less effective and the enamel demineralises. The most common reason in our practice
- MIH (molar incisor hypomineralisation): a disturbance of enamel formation in childhood, with white to yellowish-brown, sometimes sensitive areas
- Fluorosis: fine white flecks or lines after too much fluoride intake during tooth development
- Early decay: the “white spot” as the first visible stage, before a cavity forms
- After trauma to a baby tooth that disturbed enamel formation in its successor
The distinction is not theory: it determines the result you can expect. And it determines whether treatment is needed at all — a quiet, unobtrusive fluorosis fleck is not a finding that demands treatment.
How the infiltration works, step by step
One appointment, usually 30 to 60 minutes for the visible front teeth, as a rule without anaesthetic. We use Icon by DMG, an infiltration system manufactured in Germany.
Isolate
The tooth is dried and shielded from the gum. Dryness here is not comfort but a precondition: resin will not enter wet pores.
Open
Above the porous area lies a denser layer of enamel. An etching gel removes it in a matter of seconds, so that access to the pores is clear. This step is repeated as needed — it is where the real experience in this treatment lies.
Dry
An alcohol-based agent draws the remaining moisture out of the pores. This often gives an advance view of the result — the spot recedes briefly and returns when re-wetted.
Infiltrate
The thin resin is applied and drawn into the pore network by capillary action. It needs time to penetrate, is then cured with light, and repeated in a second pass.
Polish
Excess is removed and the surface smoothed. Afterwards you can eat and drink normally; there is no healing period and no restriction.
The result is visible immediately — and it is the result. There is no darkening afterwards and no waiting period in which it “gets better still”.
Where the limits are
The honest part, which product brochures tend to keep short. Infiltration works on porous areas beneath an intact surface. It does not work where the enamel has already broken down: a cavity is not an indication for infiltration but for a filling. Nor does it work into the depth of the dentine — where a discolouration originates in the dentine, it changes nothing.
With pronounced MIH, involving yellowish-brown areas that reach deeper, the result is less predictable; here infiltration can soften the contrast, and the more extensive solution may be a composite restoration or a veneer. The resin stays in the tooth — in that sense the treatment cannot be undone, even though no substance is removed. It does not, however, block anything: all further options remain open afterwards.
The manufacturer points to around 400 studies on the effectiveness of the procedure and to more than a decade of use in over 70 countries. That is a manufacturer's figure, and the evidence base is better for the aesthetics of white spots than for rare special cases. What it means for your tooth can only be judged at the tooth.
THE RIGHT MOMENT
Straight after braces come off, it is worth waiting a few months: fresh demineralisation can still partly recover with good oral hygiene and fluoride. What is left after that is the stable state — and the right starting point for the decision. If whitening is also planned, whiten first, wait two weeks, then infiltrate.
Frequently asked questions
Do the white spots disappear completely?
They often become considerably less noticeable, sometimes almost invisible — they do not always disappear completely. How good the result is depends on how deep and how porous the spot is. Surface-level spots after braces usually respond well, pronounced MIH spots less reliably. We tell you beforehand what is realistic rather than promising a result.
Is any drilling involved?
No. The surface is briefly etched with a gel to open the dense outer enamel layer, then the resin is applied and cured with light. No healthy tooth structure is removed, and as a rule no anaesthetic is needed.
How long does the result last?
The resin stays in the enamel and is not washed out. Reported follow-ups show results stable over years. Part of the colour effect can change slightly over time, and re-treatment is possible. Unlike whitening, infiltration does not have to be repeated regularly.
Is Icon the same as whitening?
No, the mechanism is different. Whitening lightens the whole tooth and often leaves a white spot still standing out, because it is lightened along with everything else. Infiltration does not change the colour but the way light is refracted in the porous enamel, so that the spot blends into its surroundings. Sometimes the combination makes sense — then in this order: whiten first, wait, then infiltrate.
Does health insurance cover the treatment?
As a rule not, where it is about appearance — then it is a private treatment. Where infiltration is used to arrest early decay between the teeth, the classification is different. You receive the costs in writing beforehand.
Does it work on brown spots too?
With brownish discolouration the result is less predictable than with white. They can often be softened, but less often made to disappear. In such cases we also discuss the alternatives, from a small composite filling through to veneers where the discolouration is pronounced.