White spots from fluorosis: choosing a treatment and what it depends on

Key points in brief

• With mild or moderate fluorosis, white spots can usually be hidden without grinding the tooth, so that they stop catching the eye, though they do not always disappear completely.
• The method depends on how the spot looks. Faint streaks may need only whitening; distinct white spots, resin infiltration (soaking them with resin); brown stains, microabrasion (wearing away surface enamel).
• The dentist diagnoses fluorosis by examining the teeth in the surgery, both moist and dried. A phone photo is not enough to tell fluorosis apart from early tooth decay.
• The dentist turns to composite, a tooth-coloured material, and veneers last. They are suggested when the enamel has pits or spots remain visible after gentler methods.
• A spot's size says less about treatment than its depth and the smoothness of the enamel. A wide, shallow streak can be easier to mask than a small, deep one.

How to tell fluorosis apart from other white spots on the teeth

What mainly sets fluorosis apart from other white spots is when and where the spots appeared. Dental fluorosis is a change in the enamel caused by too much fluoride. It develops in childhood, while the permanent teeth are still forming in the jawbone. If a child takes in too much fluoride at that time, the enamel matures with tiny pores beneath its surface. Light scatters in these pores differently than in healthy enamel, which is why white streaks or spots are visible.

Spots from fluorosis most often affect several teeth symmetrically, on both sides, and look like diffuse white lines or clouds. In teenagers, mild spots often fade over time, although in some people they become more noticeable. In a teenager, the dentist may therefore suggest monitoring the spots before any treatment.

Mild fluorosis is not a disease that has to be treated for health reasons. The spots are treated when you do not like how they look in your smile. In the severe form, when the enamel has pits, deposits and stain can collect in those hollows.

A white spot on the enamel caused by tooth decay looks different. It appears later, often next to the gum or around the place where a brace bracket was attached, and without treatment it can grow. Spots with a sharp border - white, cream, yellow or brown - more likely point to molar-incisor hypomineralisation, a different disorder of enamel development. Such spots usually sit on the first permanent molars and the incisors.

These features help in a conversation with your dentist, but they do not replace an examination. Neither looking at the teeth alone nor a picture taken with a small camera placed in the mouth fully shows how severe the change is. That is why the dentist combines several observations and does not diagnose fluorosis from a phone photo.

What you can check yourself before your appointment

A few simple observations will help the dentist assess the spots and choose a method. It is best to make them in daylight:

• whether the spots have been there for as long as you can remember, or appeared recently;
• whether they are on the same teeth on both sides;
• whether they are only white or also have brown areas;
• whether the surface is smooth, or whether you can feel rough areas or hollows with your tongue;
• whether the spots seem more noticeable when your teeth are dry, for example after talking for a long time.

The last point matters because a dried tooth looks different from a moist one. Teeth that have been dried out for half an hour change colour noticeably, and it takes up to a day for them to return to their usual shade.

Do not try to scrub the spots away at home with baking soda, lemon juice or highly abrasive toothpastes. Acid and abrasion remove enamel in an uncontrolled way, and the spot stays. For the same reason, do not use acid-containing products intended for in-surgery treatments on your own.

From whitening to veneers: in what order the methods are chosen

The dentist arranges the methods of treating fluorosis according to how much enamel they remove. Treatment starts at the lowest step that has a chance of being enough. The dentist moves to the next step when the previous one did not work, or when it is clear from the start that it will not.

1. Are the spots thin, pale lines, and is the enamel smooth? The first step is whitening, which does not remove enamel. It lightens the whole tooth, so the spots stand out less against the background.
2. Are the white spots distinct, or did they not fade after whitening? Next comes resin infiltration. The dentist fills the pores beneath the surface of the spot with a liquid resin, and the spot often stops standing out from the healthy enamel.
3. Are there also brown stains on the very surface of the teeth? For these, microabrasion helps: a very thin layer of enamel is worn away with an acidic paste. With brown discolouration it is sometimes the first step. It is often combined with whitening, because on its own it masks white spots less well.
4. Does a white spot remain visible despite infiltration, or are there small pits in the enamel? The dentist covers it with a thin layer of composite - a tooth-coloured material - bonded directly in the surgery. Sometimes a thin layer of enamel is ground away first. This procedure is also called bonding.
5. Do the changes cover most of the surface of several teeth, or does their shape also need to change? Then veneers are considered, thin shells bonded to the front surface of the tooth. They usually require a thin layer of enamel to be ground away.

The further along this sequence, the more enamel the procedure usually removes. Enamel that has once been removed cannot be recovered.

The various teeth whitening methods - in the surgery or at home, with trays and a gel from the dentist - work in a similar way: they lighten the whole tooth. With the mildest changes, whitening alone may be enough for the spots not to be visible at conversational distance. In mild and moderate fluorosis, infiltration usually masks the spots more effectively than any other method without grinding used on its own.

In-surgery whitening usually takes 1–2 visits, while home whitening with trays takes a few weeks. Infiltration and microabrasion usually take 1 visit and do not require an anaesthetic. During both procedures the dentist protects the gums, because acid is used. Composite is applied in 1 visit, while ceramic veneers usually need 2–3 visits.

At Modern Dental & Orthodontics, restorative and aesthetic treatment includes resin infiltration, composite and veneers. With veneers there is one more question, whether to choose porcelain or composite veneers, because they differ in durability and in how much enamel has to be ground away.

How the dentist assesses the depth and extent of the spots

The depth of a spot cannot be seen directly, so the dentist judges it from several features at once. First the teeth are cleaned thoroughly, because deposits change how the enamel looks. Then the dentist examines them in good light, first moist and then dried.

The first clue is colour. Thin white lines usually lie closer to the surface than chalky, matt spots, and brown areas mean discolouration that may extend into the enamel. Next the dentist checks whether the enamel is smooth, rough or has small hollows. Finally, the dentist assesses whether the changes are single lines or cover most of the tooth, and on how many teeth they appear.

On this basis the dentist determines how severe the fluorosis is. Mild fluorosis usually shows thin white lines or small flecks, and moderate fluorosis shows distinct, chalky spots over a larger part of the tooth. The more severe the form, the more often brown discolouration and small pits in the enamel appear as well.

At the same visit, the dentist also checks for tooth decay and whether the gums are healthy. Whitening and infiltration of white spots from fluorosis are not carried out on teeth with untreated decay. The plan also has to take into account old fillings in the front teeth, because they will not change colour along with the rest.

The size of a spot tells you less than it might seem. It may be possible to mask a wide but shallow streak with infiltration, while a small, deep fleck may need composite. Some of the information comes only from the first step of treatment: how the spot responds to whitening or infiltration shows whether it is necessary to go further.

Why several methods are sometimes combined

Methods are combined when spots on the same teeth differ in depth, or when there is brown discolouration alongside the white spots. Most often whitening comes before infiltration, and microabrasion is combined with whitening or with infiltration. With deeper spots, infiltration can be the first layer, and the dentist then places composite over it.

Studies indicate that in mild and moderate fluorosis, combinations of methods often give the greatest improvement in colour. It is not known, however, in what order the methods should be combined for the best effect. Whitening before infiltration does not hide the spots clearly better than infiltration alone, so it is not a compulsory step. In practice, the dentist usually starts with one method, assesses the result and only then decides whether to add a second.

With composite and veneers the order is clear: whitening is done before them, because these materials do not lighten when bleached. The shade of the composite is therefore matched to teeth that have already been lightened. Each tooth can receive a different treatment: infiltration and composite are used only where a spot still bothers you.

How to plan the colour and what to expect

The aim of treatment is for the spots to stop catching the eye. In mild and moderate fluorosis this can usually be achieved with methods that do not require grinding. In some people the spots remain slightly visible, especially in harsh light or close up.

Before treatment, agree with your dentist whether you want to lighten your teeth as a whole or only blend the spots into their current colour. This decision determines whether whitening will be the first step. The dentist takes photographs before and after treatment, in the same light, so that you can compare the result together. A phone photo can be misleading, because the camera and the lighting change the shade of the teeth.

The result also needs looking after. Composite becomes dull over time and can stain, so every few years the dentist polishes or renews it. Ceramic veneers keep their colour longer, but if enamel was ground away for the veneer, that enamel cannot be rebuilt.

Where to start treating white spots from fluorosis

Start with an examination in the surgery, because only that will show whether the spots are fluorosis and allow the dentist to assess how deep they may go. The first choice is the method that removes no enamel, or the least of it.

Frequently asked questions

Can dental fluorosis appear in an adult?

No. Fluorosis develops only while the permanent teeth are forming in the jawbone, that is, in childhood. Fluoride toothpaste used by adults will not cause it. In an adult, existing spots can at most become more or less visible. If a white spot has recently appeared on a tooth that was previously even in colour, the cause is something else, often early tooth decay. Such a spot is worth showing to a dentist.

Does whitening make white spots worse?

Whitening usually reduces the contrast of the spots, because it lightens the rest of the tooth. Straight after treatment, however, the teeth are dehydrated, and the spots may look more noticeable for a while. The result is therefore assessed a few days after whitening has finished, on a moist tooth. If the spots still stand out against the rest of the tooth, resin infiltration may be the next step.

Does resin infiltration remove white spots or mask them?

Infiltration masks the spot and does not remove it. The altered enamel stays in place, and the spot often stops standing out from the healthy enamel around it. The procedure does not require grinding; the tooth surface is prepared by etching, which means a brief application of acid. That is why infiltration comes before composite and veneers in the order of methods.

Does microabrasion for fluorosis damage the enamel?

Microabrasion removes a very thin layer of enamel, which cannot be recovered. It is used for changes that lie on the very surface, and the dentist limits the number of applications. With shallow discolouration, little enamel is lost. With deep spots, microabrasion could leave a hollow in the enamel, so the dentist then chooses a different method, most often infiltration or composite.

Do veneers on teeth with fluorosis last?

Yes, ceramic veneers on teeth with fluorosis can last for many years. After 10 years, almost all veneers in adults with moderate fluorosis were still in place. They do, however, require regular check-ups and usually the grinding away of a thin layer of enamel. The dentist therefore suggests them when gentler methods have not been enough, or when the shape of the teeth also needs to change.

How long after resin infiltration does the colour of the spot settle?

The effect is visible straight after the procedure, but the final shade is assessed the next day. During the procedure the tooth is dried, and it may look lighter for a few more hours. It is not yet known whether the effect lasts for many years in fluorosis, which is why the dentist reviews it at a check-up a few months later. Over time the resin may darken from coffee, tea or wine.

What do the teeth look like in the first days after microabrasion, and is the tooth sensitive?

Straight after the procedure the surface is smooth, and the tooth may look lighter for a short while because it is dehydrated. In studies, patients usually did not report sensitivity after microabrasion. If the tooth reacts to cold for a few days, but less and less, this sensitivity usually passes on its own. If the tooth hurts on its own, the pain is getting worse, or the sensitivity is not easing, call the practice.

Read more:

• Aesthetic and Restorative Dentistry in Warsaw
• Tooth decay stages: when can it be stopped without drilling
• Teeth whitening at the dentist and at home. Which methods are safe for your teeth?
• Porcelain vs composite veneers — which to choose? A comprehensive comparison
• Central incisor bonding — what does the procedure on the front teeth look like?

Content and liability disclaimer

This article is informational and educational in nature and does not constitute medical advice, a diagnosis or a therapeutic recommendation — it does not replace a consultation with a specialist. If you are experiencing symptoms, have doubts or are facing a decision about treatment, consult a dentist. The methods described and the data cited are general in nature. The results of scientific studies relate to populations, not to an individual patient. The course and outcome of therapy depend on the individual clinical situation and may vary between patients. No information contained in this article constitutes a guarantee of result. The content has been prepared with due care, based on publicly available medical knowledge and the scientific publications indicated in the Sources section. We do not advise taking or refraining from any health-related action solely on the basis of the content of this article, without prior consultation with a doctor.

Sources

Source 1

Links https://doi.org/10.1177/0022034520906089 │ https://pubmed.ncbi.nlm.nih.gov/32091961/

Description Curtis AM, Levy SM, Cavanaugh JE, Warren JJ, Kolker JL, Weber-Gasparoni K. „Decline in Dental Fluorosis Severity during Adolescence: A Cohort Study.” Journal of Dental Research. 2020;99(4):388-394.

Source 2

Links https://doi.org/10.1186/s12903-021-01729-3 │ https://pubmed.ncbi.nlm.nih.gov/34294056/

Description Saldarriaga A, Rojas-Gualdrón DF, Restrepo M, Bussaneli DG, Fragelli C, de Cássia Loiola Cordeiro R, Santos-Pinto L, Jeremias F. „Clinical changes in the severity of dental fluorosis: a longitudinal evaluation.” BMC Oral Health. 2021;21(1):366.

Source 3

Links https://doi.org/10.2341/24-137-C │ https://pubmed.ncbi.nlm.nih.gov/40485090/

Description Abogazalah N, Al Dehailan L, Soto-Rojas AE, Ando M, Martignon S, Eggertsson H, Shone D, Martinez-Mier EA. „The Use of Intraoral Camera, Quantitative Light Fluorescence, and Visual Examinations for the Detection and Assessment of Enamel Fluorosis.” Operative Dentistry. 2025;50(3):311-323.

Source 4

Links https://doi.org/10.1111/jerd.12612 │ https://pubmed.ncbi.nlm.nih.gov/32573090/

Description Hatırlı H, Karaarslan EŞ, Yaşa B, Kılıç E, Yaylacı A. „Clinical effects of dehydration on tooth color: How much and how long?” Journal of Esthetic and Restorative Dentistry. 2021;33(2):364-370.

Source 5

Links https://doi.org/10.1016/j.jdent.2024.105276 │ https://pubmed.ncbi.nlm.nih.gov/39103078/

Description Wittich FK, Cebula M, Effenberger S, Schoppmeier CM, Schwendicke F, Barbe AG, Wicht MJ. „Masking efficacy of bleaching and/ or resin infiltration of fluorotic spots on anterior teeth – a systematic review and meta-analysis.” Journal of Dentistry. 2024;149:105276.

Source 6

Links https://doi.org/10.1007/s00784-021-03931-7 │ https://pubmed.ncbi.nlm.nih.gov/34106348/

Description Bourouni S, Dritsas K, Kloukos D, Wierichs RJ. „Efficacy of resin infiltration to mask post-orthodontic or non-post-orthodontic white spot lesions or fluorosis – a systematic review and meta-analysis.” Clinical Oral Investigations. 2021;25(8):4711-4719.

Source 7

Links https://doi.org/10.1111/jerd.70028 │ https://pubmed.ncbi.nlm.nih.gov/40878777/

Description Han H, Lan T, Li F, Sun H. „Resin Infiltration for Dental Fluorosis: A Systematic Review and Meta-Analysis of Randomized Controlled Trials on Esthetic Masking Efficacy.” Journal of Esthetic and Restorative Dentistry. 2025;37(12):2579-2589.

Source 8

Links https://doi.org/10.2341/19-248-C │ https://pubmed.ncbi.nlm.nih.gov/32926733/

Description Divyameena B, Sherwood A, Rathna Piriyanga S, Deepika G. „Clinical Performance of Enamel Microabrasion for Esthetic Management of Stained Dental Fluorosis Teeth.” Operative Dentistry. 2021;46(1):15-24.

Source 9

Links https://doi.org/10.1111/jerd.70119 │ https://pubmed.ncbi.nlm.nih.gov/41623091/

Description Chaple Gil AM, Pereda Vázquez L, Santiesteban Velázquez M, Menendez JJ. „Minimally Invasive Treatments for Dental Fluorosis: A Network Meta-Analysis of Esthetic Masking Efficacy.” Journal of Esthetic and Restorative Dentistry. 2026;38(7):1323-1337.

Source 10

Links https://doi.org/10.1186/s12903-022-02079-4 │ https://pubmed.ncbi.nlm.nih.gov/35172796/

Description Demirekin ZB, Turkaslan S. „Laminate veneer ceramics in aesthetic rehabilitation of teeth with fluorosis: a 10-year follow-up study.” BMC Oral Health. 2022;22(1):42.