Dental erosion is the loss of tooth structure caused by acid dissolving the hard outer layer of your teeth (enamel) without any bacteria involved. Unlike cavities, which form when bacteria produce acid in a specific spot, erosion happens when acids from food, drinks, or your own stomach wash broadly across tooth surfaces and chemically soften them away. It’s surprisingly common: a 2025 meta-analysis covering more than 92,000 people found that about 41% of the general population shows some degree of tooth wear, with erosion being one of the four main types.
How Acid Dissolves Enamel
Enamel is mostly made of a mineral called hydroxyapatite, a crystalline structure of calcium and phosphate. When your teeth are exposed to an acidic environment, those minerals dissolve out of the enamel surface in a process called demineralization. Your saliva normally counteracts this by supplying calcium and phosphate that can redeposit onto teeth, but when acid exposure is frequent or prolonged, the balance tips toward net mineral loss.
There isn’t one fixed pH at which enamel starts dissolving. The threshold depends on how much calcium and phosphate are already present in the surrounding fluid. For someone with low salivary calcium and phosphate, enamel can begin dissolving at a pH as high as 6.5. For someone with mineral-rich saliva, the threshold may be closer to 5.5. This explains why two people with similar diets can have very different erosion outcomes: saliva composition matters as much as what you eat and drink.
What Causes It
The acids responsible for erosion come from two directions: outside your body (extrinsic) and inside it (intrinsic).
Extrinsic sources are mostly dietary. A study in the Journal of the American Dental Association tested 379 commercially available beverages and found that 93% had a pH below 4.0, the threshold generally considered erosive. Of those, 39% were extremely erosive with a pH below 3.0. Soft drinks, sports drinks, fruit juices, wine, and flavored waters are the most common culprits. Even “healthy” choices like orange juice and kombucha sit well within the erosive range.
Intrinsic acid comes from your stomach. Gastroesophageal reflux disease (GERD) sends stomach acid up into the mouth repeatedly, often without you realizing it. Eating disorders involving frequent vomiting, such as bulimia, cause some of the most severe erosion dentists see, typically on the inner surfaces of the upper front teeth. Morning sickness during pregnancy can have a similar, though usually temporary, effect.
Early Signs to Watch For
Erosion develops gradually, and the earliest changes are easy to miss. According to the Cleveland Clinic, initial signs include increased tooth sensitivity (especially to hot, cold, or sweet foods), slight discoloration as the yellowish layer beneath enamel starts showing through, small chips along the biting edges, and shallow pitting on tooth surfaces. The edges of front teeth may look translucent or glassy because the enamel has thinned enough for light to pass through.
On back teeth, erosion often creates small, rounded depressions on the chewing surface called “cupping.” These are distinct from the sharp, flat wear patterns caused by grinding. As erosion progresses, fillings may start to look like they’re rising above the surrounding tooth surface because the enamel around them has worn away while the filling material hasn’t.
How Dentists Assess Severity
Dentists use a screening tool called the Basic Erosive Wear Examination (BEWE) to grade erosion severity. The mouth is divided into six sections, and each section is scored from 0 to 3. A score of 1 means early surface changes are visible. A score of 2 means less than half of the tooth surface is affected. A score of 3 means more than half the surface has been lost. The combined score guides how aggressively the erosion needs to be managed, from simple dietary advice for mild cases to restorative dental work for severe ones.
The Role of Diet and Beverages
Frequency of acid contact matters more than total amount consumed. Sipping a soda over two hours exposes your teeth to acid continuously, while drinking the same amount at a meal and moving on gives saliva time to neutralize the acid and begin repairing the surface. Using a straw for acidic drinks reduces contact with teeth, and finishing a meal with cheese or milk introduces calcium that helps buffer the acid.
One practical finding worth knowing: calcium-fortified juices are meaningfully less erosive than their regular versions. Research published in the Journal of the American Dental Association found that fortifying apple, orange, and grapefruit juices with calcium prevented enamel erosion entirely and reduced root surface erosion. Even white grape juice showed significantly less enamel damage when calcium-fortified. The calcium in the juice makes the liquid less undersaturated with respect to your enamel minerals, so less dissolving occurs. If you drink fruit juice regularly, choosing a calcium-fortified version is a simple, evidence-based swap.
Should You Wait to Brush After Eating?
You’ve probably heard the advice to wait 30 minutes after eating or drinking something acidic before brushing, on the theory that brushing softened enamel scrubs it away faster. The logic sounds reasonable, but the evidence behind it is weaker than you might expect. A case-control study found that brushing within 10 minutes of acid intake was not significantly associated with erosive tooth wear after adjusting for dietary factors. The researchers concluded that universal advice to delay brushing after meals is not substantiated by their findings.
This doesn’t mean you should aggressively scrub right after drinking lemon water. But it does mean you shouldn’t skip brushing altogether out of fear of doing harm. Using a soft-bristled brush and fluoride toothpaste matters more than precise timing.
How Erosion Is Treated
Enamel doesn’t contain living cells, so once it’s gone, your body can’t grow it back. Treatment depends on the stage. For early erosion where enamel is softened but not yet physically lost, fluoride treatments can help harden the remaining surface. High-concentration fluoride varnishes applied by a dentist create a protective mineral layer that resists further acid attack. Research shows that fluoride varnish, combined with regular brushing with fluoride toothpaste (at least 1,450 parts per million), is effective at hardening and arresting early mineral loss.
For moderate erosion with visible tooth structure loss, dentists may place bonded composite resin over the worn areas to rebuild shape and protect the exposed layer beneath the enamel. Severe erosion, where teeth have lost significant height or the inner layer is broadly exposed, sometimes requires crowns or porcelain veneers to restore function and protect what remains.
None of these treatments work well if the source of acid isn’t addressed. If reflux is the cause, managing it with your doctor is a prerequisite for any dental repair lasting long-term. If diet is the driver, shifting habits around how and when you consume acidic foods is the foundation that everything else builds on.
Who Is Most at Risk
People with chronic acid reflux or frequent vomiting face the highest erosion risk because stomach acid is far more acidic (pH around 1.0 to 2.0) than any food or drink. Dry mouth, whether from medications, medical conditions, or mouth breathing, removes the protective buffering effect of saliva and accelerates mineral loss. Swimmers who train in poorly maintained pools can experience erosion from chlorinated water, though this is uncommon with modern pool chemistry.
Children and teenagers deserve special attention. Their enamel is thinner and more porous than adult enamel, and their consumption of sports drinks and soft drinks tends to be high. Erosion that begins in adolescence compounds over a lifetime because the lost enamel never returns, leaving teeth progressively more vulnerable to sensitivity, discoloration, and structural failure.