Acidic drinks and dental wear: what pH does to enamel

Dental wear is a dynamic process that involves the irreversible loss of the tooth's hard tissues: enamel, dentin and cementum. Unlike caries, this degradation has a multifactorial origin and is produced by physical or chemical mechanisms that occur independently of bacterial activity. I see it frequently in practice, and almost always the patient arrives without realizing the damage has been progressing for years.

It helps to separate the types. Attrition is mechanical wear from direct contact between tooth surfaces, often linked to bruxism, and shows up clinically as flattening of homologous cusps and incisal edges. Abfraction is a wedge-shaped cervical lesion linked to masticatory stress. Erosion is the loss of dental structure by chemical dissolution, usually from repeated exposure to extrinsic acids (drinks, food) or intrinsic ones (reflux, recurrent vomiting). It leaves matte, smooth surfaces with rounded depressions, especially on the palatal surfaces of upper incisors, the occlusal surfaces of molars and the incisal edges. This article focuses on erosion from acidic drinks.

Dental enamel begins to demineralize when the pH of the medium in contact with the tooth drops below 5.5. What most patients don't know is that many of the drinks they consume daily lower that threshold several times a day, for years.

Approximate pH table of common drinks, so you can dimension what happens in your mouth each time you consume them: lemon juice 2.0; Coca-Cola 2.5; Red Bull, Monster and other energy drinks between 2.5 and 3.4; Sprite, Pepsi, Fanta between 2.5 and 3.5; red wine 3.3 to 3.6; coffee 5.0; milk 6.5 to 6.8; water 7.0. The lower the pH, the more acidic the drink, the greater the capacity to dissolve enamel.

How I identify erosion when a patient comes to consultation: generalized flattening of occlusal cusps, cervical sensitivity even without visible recession, translucent or bluish enamel at incisal edges, cup or crater formation on occlusal cusps, and restorations that look elevated because the tooth around them has worn. In advanced cases, anterior teeth visibly shorten and vertical dimension decreases.

Frequency matters much more than total quantity. A can of acidic drink consumed through a straw in five minutes generates much less damage than the same amount consumed slowly over 30 minutes. Each prolonged sip keeps pH low and extends the demineralization window. Patients who keep an energy drink on their desk all morning are the ones who arrive with severe erosion, not those who drink occasionally with meals.

Concrete protection strategies. Concentrate the consumption of acidic drinks in specific moments rather than spreading it throughout the day. Drink through a straw, positioned toward the back of the mouth, to reduce contact with anterior teeth. Rinse with water afterward. Don't brush immediately: softened enamel wears more under brush friction, wait at least 30 minutes. Pair the most acidic drinks (lemon juice, energy drinks, sodas) with meals, where saliva helps neutralize pH. And add fluoride products to your daily routine to support enamel remineralization.

An important clinical detail: diet or zero versions are not less acidic than regular ones. Sugar causes caries (because bacteria metabolize it to acid), but the citric and phosphoric acid that flavor these drinks is present with or without sugar. Coca-Cola Zero erodes enamel exactly like regular Coca-Cola. Switching to diet protects against caries, not against erosion.

Once enamel has worn, it doesn't regenerate. Restorations that replace lost structure exist (direct composite, veneers, crowns), but original enamel doesn't come back. That's why prevention and early detection are clinically preferable to later rehabilitation. If you have doubts about your dental wear pattern, an evaluation with clinical photography and serial digital models lets us quantify progression and act before it's irreversible.