White spots on teeth: from trivial causes to problems with the enamel

White spots on teeth are areas where the enamel takes on a lighter, duller or more opaque appearance compared to the rest of the tooth’s surface. These may be caused by demineralisation, dental fluorosis, defects in enamel development or temporary dehydration. Treatment depends on the cause and may include remineralisation, resin infiltration or cosmetic procedures.

Although some white spots are merely cosmetic changes, others may indicate the onset of a carious lesion. A dental assessment allows the cause to be identified and an approach chosen that preserves as much of the tooth’s natural structure as possible. 

The whitish appearance of enamel occurs when its structure alters the way light is reflected. In the case of demineralisation, the loss of minerals from the enamel creates areas of increased porosity, which become visible as white, matt or chalky patches.

However, not every white spot indicates a recent loss of minerals. Some spots are present from the moment the tooth erupts, as a result of changes that occurred during the formation of the enamel. Others may become temporarily more visible when the tooth surface becomes dehydrated.

Distinguishing between these situations is important because an active demineralisation lesion requires a different approach to an enamel development defect or a temporary change in appearance.

White spots can have various causes, ranging from mineral loss in the enamel to changes that occur during tooth formation. Their appearance, location and the time at which they appear provide the dentist with important clues for making a diagnosis.

Enamel demineralisation and early-stage tooth decay

Demineralisation occurs when the enamel loses minerals, particularly due to the action of acids produced by bacteria in dental plaque. Frequent consumption of sugars and poor oral hygiene contribute to this process.

The first signs may be white, matt, chalky-looking spots, observed mainly near the gums or in areas where bacterial plaque accumulates more easily. These may represent early-stage carious lesions, without cavitation.

If identified in time, these lesions can be stabilised by controlling risk factors and through remineralisation treatments, without the need to remove any tooth structure.

Dental fluorosis and excess fluoride in childhood

Dental fluorosis occurs as a result of excessive exposure to fluoride during the formation of permanent teeth in childhood. This can cause changes to the structure of the enamel, which become visible after the teeth have erupted.

In mild cases, fluorosis manifests as whitish lines or spots, sometimes distributed symmetrically across several teeth. In more severe cases, discolouration and defects in the enamel surface may occur.

Unlike active demineralisation, fluorosis is a developmental defect, and the therapeutic approach depends mainly on the severity of the changes and their aesthetic or functional impact.

Enamel hypoplasia and hypomineralisation

Some white spots arise due to developmental defects in the enamel, which occur before the tooth erupts.

Enamel hypoplasia involves the formation of an insufficient amount of enamel. The tooth may exhibit thinned areas, grooves or small surface defects.

Enamel hypomineralisation occurs when the enamel is insufficiently mineralised, even though its thickness may be normal. The affected areas may appear creamy white or yellowish and, in some cases, may be associated with tooth sensitivity and increased fragility.

These changes can affect both milk teeth and permanent teeth. Treatment is determined based on the extent of the defect, sensitivity and the risk of further enamel damage.

White spots after braces are removed

After the removal of fixed braces, some people notice white spots in the areas where the brackets were attached. These are often the result of enamel demineralisation, caused by the build-up of bacterial plaque around the orthodontic appliances.

The spots may become more noticeable after the brackets are removed, but the demineralisation process can begin even whilst treatment is still ongoing.

Depending on the depth and activity of the lesions, the dentist may recommend remineralisation, monitoring or resin infiltration using the ICON technique for certain eligible lesions.

Temporary dehydration of the enamel and other contributing factors

Sometimes, white spots become more visible when the enamel is temporarily dehydrated, for example after keeping the mouth open during a dental procedure. The appearance may diminish once the tooth surface has rehydrated.

Separately, reduced saliva flow, known as xerostomia or dry mouth, can increase the risk of demineralisation, as saliva helps to neutralise acids and protect the enamel.

Frequent consumption of acidic drinks can promote dental erosion, a process distinct from bacterial tooth decay. Therefore, identifying the mechanism affecting the enamel is essential before choosing a treatment. 

White spots can appear at any age, but the causes and associated risks vary depending on the stage of tooth development, oral hygiene habits and medical history.

White spots on milk teeth and permanent teeth

In children, white spots may indicate early demineralisation of the enamel, as well as developmental defects such as hypoplasia or hypomineralisation.

Milk teeth have a thinner layer of enamel than permanent teeth, which can lead to the faster progression of carious lesions. Frequent consumption of sweetened drinks, including from a bottle, and difficulties with oral hygiene can contribute to their development.

In the case of permanent teeth, spots may be visible as soon as they erupt if the enamel was affected during formation. A paediatric dental assessment helps to distinguish between these situations.

White spots on teeth in adults

In adults, white spots may be associated with enamel demineralisation, including following orthodontic treatment, but they may also represent developmental defects that have been present for some time.

Poor oral hygiene, frequent consumption of sugars and reduced saliva flow can increase the risk of demineralisation lesions. Treatment is determined based on the cause of the spots, the extent of the lesions and the patient’s aesthetic goals.

When do white spots on teeth most commonly appear?

White spots can appear at any age, but are most commonly seen in children, due to their diet and less rigorous oral hygiene.  

In teenagers and adults, they can occur due to frequent consumption of acidic drinks (such as fizzy drinks) or due to a dry mouth (xerostomia), which can reduce the effectiveness of saliva in protecting the teeth.

Not all white spots require the same treatment. Some represent stable changes in the enamel, whilst others may indicate an active lesion that requires treatment to prevent it from progressing.

A dental check-up is recommended, particularly if:

• The spots have appeared recently or are becoming more noticeable.
• The affected areas have a matt, chalky appearance or a rough surface.
• The spots are located near the gums or in areas where bacterial plaque accumulates.
• You experience tooth sensitivity, discolouration or loss of tooth structure.
• The spots have become visible after the removal of braces.

During the consultation, the dentist assesses the appearance and location of the spots, the texture of the tooth surface, the history of their onset and any risk factors. In some cases, further investigations may be necessary.

An accurate diagnosis allows active demineralisation to be distinguished from fluorosis, hypoplasia or hypomineralisation, and helps to avoid cosmetic treatments that do not address the root cause of the problem. 

The treatment of white spots on the teeth depends on their cause, the depth of the changes to the enamel, and their aesthetic or functional impact. In cases of early-stage demineralisation, remineralisation and monitoring may be sufficient. For other types of stains, the dentist may recommend resin infiltration, microabrasion or restorative treatments.

There is no one-size-fits-all treatment for all white spots. The choice of procedure should be made once a diagnosis has been established, with priority given to methods that preserve the natural tooth structure. 

There are several options for treating white spots on teeth, in both children and adults.

Enamel remineralisation and fluoride treatments 

Remineralisation aims to restore the mineral balance of the enamel in areas affected by early-stage lesions without cavities. Fluoride contributes to this process and helps increase the enamel’s resistance to acid attacks.

Depending on the risk of caries and the severity of demineralisation, the dentist may recommend the professional application of fluoridated products, such as fluoride varnish, alongside the use of fluoride toothpaste and improved oral hygiene.

These measures can help to stabilise early-stage lesions and prevent their progression. However, remineralisation does not guarantee the complete disappearance of the whitish appearance, particularly in the case of deep stains or developmental defects in the enamel. 

Fluoride varnish

One of the most commonly used treatments for tooth demineralisation is the application of a fluoride varnish. This is a gel or substance containing concentrated fluoride, which is applied directly to the surface of the teeth by the dentist. Fluoride is essential for the remineralisation process, as it strengthens the enamel and reduces the risk of tooth decay.

How does fluoride varnish work?

Fluoride varnish creates a thin film on the surface of the teeth, which helps the fluoride to be absorbed into the tooth enamel. It helps to replenish lost minerals and protect the enamel against acid attacks from food or bacteria. The treatment is effective even in the early stages of demineralisation, when white spots are visible on the teeth.

Advantages:

• it is quick and painless to apply.
• provides long-term protection for the enamel.
• It is recommended for all patients, including children and those with sensitive teeth.

Professional dental fluoridation

Dental fluoridation is a dental treatment that involves applying a fluoride gel or solution directly to the teeth to strengthen the enamel and prevent tooth decay. Fluoride plays a crucial role in protecting the enamel and in the remineralisation process.

How does fluoridation work?

Fluoride helps to restore minerals lost from the enamel and prevent further demineralisation. The application of fluoride can significantly reduce the risk of tooth decay and may even reverse early-stage demineralisation when treated correctly.

Advantages:

• it is a simple and quick method of preventing tooth decay
• it reduces the risk of white spots and tooth decay
• it can be applied periodically, particularly in patients at high risk of demineralisation (children, people who frequently consume sugar or acids)

 Resin infiltration – the ICON technique

The ICON (Conservative Infiltration of Lesions) technique is a minimally invasive method that uses a special resin to infiltrate the pores in certain enamel lesions. This technique is used to repair damaged tooth enamel without the need to remove the affected tooth tissue, making it an excellent alternative to traditional treatment methods.

How does the ICON technique work?

ICON uses a resin-based substance that penetrates the affected tooth enamel, infiltrating the porous, demineralised areas and filling them with a substance that recreates the natural appearance of the teeth. This helps to reduce white spots and strengthen the enamel without the need for a traditional filling.

Advantages:

• it is a minimally invasive treatment that does not require drilling
• it helps improve the appearance of the teeth
• it is effective in the early stages of demineralisation and can prevent these from progressing to cavities

ICON may be an option for certain white spots that appear after orthodontic treatment or for other eligible lesions, depending on their depth and characteristics.

Aesthetic results may vary, and not all white spots can be effectively treated using this method. The dentist determines suitability following a clinical assessment. 

Enamel microabrasion

Microabrasion is a procedure that allows the controlled removal of a very superficial layer of enamel to reduce certain spots or discolouration.

It may be recommended in some cases of mild fluorosis or for superficial stains, following an assessment of the thickness and integrity of the enamel.

As it involves the removal of a small amount of dental tissue, microabrasion is not suitable for all types of white spots. In the case of deep defects, the results may be limited.

Teeth whitening and its limitations

Teeth whitening alters the overall shade of the teeth, but it does not treat the cause of white spots nor does it restore the structure of the affected enamel.

In some situations, whitening can reduce the visual contrast between the spots and the rest of the tooth surface. In other cases, the spots may become temporarily more noticeable, partly due to dehydration of the enamel.

For this reason, teeth whitening should not be considered the first-line treatment for white spots. Your dentist may recommend treating existing lesions before a whitening procedure or may suggest a phased aesthetic approach.

Composite restorations and dental veneers

When white spots are associated with extensive enamel defects or cannot be satisfactorily corrected using conservative methods, your dentist may recommend restorative treatments.

Composite resin restorations allow for the correction of localised defects, whilst, for adults, dental veneers may be considered in selected situations where aesthetic changes are more extensive.

The choice of treatment depends on the amount of healthy enamel, the severity of the defects, the patient’s age and the aesthetic objectives. In general, priority is given to solutions that preserve as much of the tooth’s natural structure as possible.

Preventing white spots caused by demineralisation starts with good oral hygiene and minimising the factors that contribute to mineral loss from the enamel.

• Maintain good oral hygiene by brushing your teeth twice a day with a fluoride toothpaste and cleaning between your teeth with dental floss or a mouthwash.
• Pay particular attention to oral hygiene during orthodontic treatment, especially around brackets and other parts of the dental appliance.
• Book regular dental check-ups for preventive care, to identify changes in the enamel at an early stage.
• Moderate your intake of acidic or sweet foods: Avoid frequent consumption of fizzy drinks, fruit juices and sweets, as these can accelerate the demineralisation of enamel. If you do consume such foods, try to rinse your mouth with water after every meal.
• A diet rich in calcium and vitamin D: A balanced diet, rich in calcium and vitamin D, is essential for maintaining dental health. Foods such as dairy products, green leafy vegetables and fish are excellent sources of nutrients for strong teeth.
• Calcium and fluoride supplements: If your diet is not sufficient, it is advisable to consult your dentist or GP for guidance on choosing a suitable supplement.
• Talk to your doctor about persistent dry mouth, as reduced saliva flow can increase the risk of tooth decay.

Avoid abrasive or acidic home remedies, such as aggressive use of bicarbonate of soda or applying lemon juice to your teeth. These do not treat enamel defects and may cause further damage.

Furthermore, calcium or fluoride supplements should not be taken to treat white spots without medical advice. Spots caused by fluorosis or enamel development defects cannot be removed simply by changing your diet.

If you are a parent, help your child develop healthy habits from an early age. Daily toothbrushing, appropriate for their age and carried out with an adult’s help, together with a balanced diet and regular dental check-ups, helps prevent tooth decay and maintain dental health.