How Acidic Foods Affect Your Tooth Enamel

Enamel is the hardest tissue the body produces. It is also, unusually, not living — it contains no cells and no blood supply, which means it cannot repair itself in the way bone or skin can.

That fact governs everything about dental erosion. Damage accumulates rather than healing, and the process is slow enough that people rarely notice until a decade or more of change has occurred.

Enamel is composed largely of hydroxyapatite, a crystalline calcium phosphate mineral. In an acidic environment, hydrogen ions react with this structure and calcium and phosphate ions are released into solution. This is demineralisation.

The threshold at which it begins is approximately pH 5.5 for enamel. Below that, mineral is lost from the surface.

The counterbalancing process is remineralisation. Saliva is supersaturated with calcium and phosphate, and once the pH rises again those ions redeposit onto the enamel surface. Fluoride assists this substantially, and the resulting fluorapatite is more resistant to acid than the original mineral.

Dental health, in this specific respect, is the balance between these two processes over time. Erosion occurs when demineralisation consistently outpaces remineralisation.

Two important points follow. First, an early demineralised surface can partially recover — which is why early white-spot lesions are sometimes reversible. Second, once enamel has actually been lost in bulk, it does not come back. There is no biological mechanism for regenerating it.

Two people eating identical diets can have very different amounts of wear, and saliva is usually the reason.

Saliva buffers acid, using bicarbonate and phosphate systems to raise pH back towards neutral. It clears acid physically from the mouth. It supplies the calcium and phosphate needed for remineralisation. And it forms the acquired pellicle, a thin protein film on the tooth surface that provides a degree of physical protection.

Recovery takes time — typically somewhere in the region of half an hour to an hour after an acid exposure. This is why frequency matters far more than quantity. Six separate acid exposures spread through the day cause far more cumulative damage than the same total consumed at two meals.

Reduced saliva substantially raises risk. Common causes include many prescribed medications, particularly antidepressants, antihistamines and some blood pressure medications; Sjögren's syndrome and other conditions; previous radiotherapy to the head and neck; dehydration; and mouth breathing, including during sleep.

Citrus fruits and juices — lemons, limes, oranges, grapefruit. Sucking lemon slices or lemon water first thing is a pattern that causes noticeable wear.

Vinegar and dressings, including balsamic and pickled foods.

Sour and acidic sweets, which combine low pH with prolonged contact time.

Fruit-flavoured and herbal teas, particularly hibiscus and citrus infusions.

Berries, apples, grapes and other fruit, which are acidic though generally consumed as part of a meal.

Yoghurt and fermented products, mildly acidic, though the calcium content is protective.

Wine, kombucha, and carbonated drinks. Our article on drinks that harm enamel covers beverages in detail.

Tomatoes and tomato-based sauces.

The intention is not to eliminate these — many are nutritionally valuable and the advice to avoid fruit would be poor health advice. It is to change how and when they are consumed.

A significant proportion of erosion has nothing to do with diet, and missing this leads to advice that does not work.

Gastro-oesophageal reflux, including silent reflux without heartburn, brings stomach acid at approximately pH 1–2 into the mouth. The pattern of wear — typically on the palatal surfaces of the upper teeth — is characteristic, and dentists sometimes identify reflux before the patient is aware of it.

Vomiting, including in pregnancy, in eating disorders and with certain medical conditions.

Occupational exposure, historically in some industrial settings, and in competitive swimming where pool water is inadequately pH-controlled.

Some medications taken in acidic form, including chewable vitamin C and certain effervescent preparations.

Erosion also rarely occurs in isolation. It typically combines with attrition — tooth-on-tooth wear from grinding — and abrasion from over-vigorous brushing. Acid-softened enamel is far more susceptible to both, which is why they compound one another. Our article on whether brushing harder cleans better covers the abrasion component, and our TMJ treatment page the grinding component.

Early changes are subtle and easily missed. Later signs include:

• Increasing translucency at the incisal edges of the upper front teeth, sometimes with chipping

• A smooth, glazed, rounded appearance to surfaces that should have texture

• Cupping — small dished-out hollows on the biting surfaces of molars, often with a rim of enamel remaining

• Fillings appearing to stand proud, because the surrounding tooth has worn away while the restoration has not

• Teeth appearing more yellow, as thinning enamel reveals more of the dentine beneath

• Shortening of the teeth and changes to the bite

• Generalised sensitivity to cold, sweet and acidic things

Erosion is monitored rather than simply noted. Clinical photographs, study models or digital scans taken at intervals allow change to be measured over time, which is the only reliable way to distinguish active progressive wear from historic wear that has stabilised. That distinction determines whether intervention is needed now.

Identifying the cause comes first. Dietary history, questions about reflux, assessment of saliva, and examination of the wear pattern. Restoring worn teeth without establishing why they wore is not a durable plan.

Preventive measures. Fluoride toothpaste, often at higher strength on prescription; fluoride varnish applied professionally; dietary modification; management of reflux with a doctor; and addressing dry mouth.

Protective measures. A night guard where grinding is contributing.

Restorative treatment where function, sensitivity or appearance require it. This may involve white fillings or composite bonding to restore worn surfaces, dental crowns where more coverage is needed, or in extensive cases full mouth reconstruction to rebuild the bite.

Regular check-ups are how progressive wear is caught while it is still manageable with prevention rather than restoration.

Confine acidic foods and drinks to mealtimes rather than grazing. Finish with something neutral — cheese, milk or plain water. Rinse with water after acidic food. Do not brush for around an hour afterwards, since softened enamel is more readily abraded. Chew sugar-free gum to stimulate saliva. Use fluoride toothpaste and spit rather than rinse. And discuss reflux with your doctor if you suspect it.

If your teeth have become more sensitive, look shorter or more translucent than they did, or if you have reflux, an assessment can establish whether wear is active and what is driving it.

You can arrange an appointment at our Wimpole Street practice.

This article is provided for general information only and does not constitute personalised dental, dietary or medical advice. Tooth wear has multiple possible causes and requires clinical examination by a registered dental professional to assess. Discuss suspected reflux or any dietary change relevant to a medical condition with your doctor.

Next review due: 7 September 2027