Acid reflux can cause serious, lasting damage to your teeth. Stomach acid has a pH below 2.0, and tooth enamel begins dissolving at a pH of 5.5. That means every time acid reaches your mouth, whether you feel it or not, it’s strong enough to strip away the protective outer layer of your teeth. A meta-analysis of 28 studies found that about half of people with chronic acid reflux show signs of dental erosion, compared to roughly 21% of people without it.
How Stomach Acid Dissolves Enamel
Enamel is the hardest substance in the human body, but it has a chemical weakness: acid. Enamel is made of tightly packed mineral crystals that hold together as long as the surrounding environment stays above a pH of about 5.5. Below that threshold, those crystals start dissolving. Stomach acid sits far below that line, typically under pH 2.0, making it aggressive enough to cause visible erosion over time.
The process is straightforward. When stomach contents travel upward and reach the mouth, the acid coats the surfaces of your teeth. It chemically dissolves the mineral structure of the enamel, thinning it layer by layer. This is different from the kind of tooth decay caused by bacteria. Bacterial cavities tend to form in pits and between teeth, while acid erosion from reflux typically affects broader surfaces, especially the backs of the upper teeth and the biting surfaces of the molars, since those are the areas stomach acid contacts most directly.
What Erosion Looks and Feels Like
Reflux-related erosion develops gradually, so many people don’t notice it until the damage is moderate. Early signs include teeth that look slightly more yellow than they used to. This happens because thinning enamel reveals more of the darker layer underneath called dentin. Teeth may also start to appear slightly translucent or glassy along the edges, particularly on the front teeth.
As erosion progresses, you might notice small concave dips forming on the chewing surfaces of your back teeth, almost like shallow cups. Teeth can become noticeably more sensitive to hot, cold, or sweet foods as the protective enamel barrier thins. In advanced cases, teeth look shorter, feel rough, or develop sharp edges. Fillings may seem to stand higher than the surrounding tooth surface because the enamel around them has worn away while the filling material stayed intact.
Silent Reflux Is Harder to Catch
Not all reflux causes heartburn. Laryngopharyngeal reflux, often called “silent reflux,” sends stomach contents up into the throat and mouth without the burning sensation most people associate with acid reflux. Because there’s no obvious discomfort, many people with silent reflux don’t realize they have it. One study found that 70% of patients with silent reflux had dental erosion, compared to 30% of patients with typical heartburn-style reflux and just 10% of healthy controls.
This is why dentists sometimes spot reflux before a gastroenterologist does. A distinctive pattern of erosion on the inner surfaces of the upper teeth, combined with no obvious dietary explanation, can prompt a dentist to suggest reflux testing. If your dentist mentions unusual wear patterns, it’s worth taking seriously even if you’ve never experienced heartburn.
Saliva’s Role in Protection
Your saliva is the mouth’s primary defense against acid. It contains a bicarbonate buffering system that neutralizes acids and helps maintain a stable pH. Saliva also carries calcium and phosphate ions that can partially rebuild mineral lost from enamel surfaces, a process called remineralization.
The problem is that chronic reflux appears to compromise this defense system. Research comparing saliva in people with and without GERD found that reflux patients produced less saliva overall, and their saliva had reduced buffering capacity. In other words, the people who need saliva’s protection most are getting less of it. Anything that worsens dry mouth, including certain medications, mouth breathing during sleep, or dehydration, compounds the problem.
Protecting Your Teeth After a Reflux Episode
One of the most important things to know is that you should not brush your teeth immediately after acid reaches your mouth. Acid softens the enamel surface temporarily, and brushing while it’s in that weakened state can physically scrub away mineral that would otherwise reharden. Wait at least 30 minutes before brushing.
What you should do right away is rinse. Plain water helps, but an alkaline rinse is more effective at neutralizing the acid. You can make one at home by mixing four cups of warm water with one teaspoon of table salt and one teaspoon of baking soda. Swish about a tablespoon of the solution around your mouth for 15 to 30 seconds and spit it out. The mixture keeps at room temperature for up to two weeks. Keeping a bottle by your bed is practical if nighttime reflux is an issue.
Strengthening Enamel Against Acid
Fluoride is the most well-established tool for making enamel more resistant to acid. When fluoride gets incorporated into the enamel’s crystal structure, it forms a modified mineral that doesn’t begin dissolving until the pH drops below about 4.0, a meaningful improvement over untreated enamel’s threshold of 5.5. Using a fluoride toothpaste twice daily is a baseline. Your dentist may also recommend prescription-strength fluoride toothpaste or professional fluoride varnish treatments applied periodically in the office.
Products containing a compound called CPP-ACP (sold under brand names like MI Paste) offer another layer of defense. This ingredient stabilizes calcium and phosphate ions and delivers them to the tooth surface, essentially feeding the enamel the raw materials it needs to remineralize. Versions that combine CPP-ACP with fluoride release substantially more calcium, phosphate, and fluoride than conventional fluoride varnishes alone. These products are available over the counter in some countries and by prescription in others.
Repairing Damage That’s Already Done
Enamel doesn’t regenerate once it’s gone. Minor surface softening can remineralize with fluoride and calcium treatments, but once erosion has physically removed enamel, the only option is dental restoration. The approach depends on how much tooth structure has been lost.
For mild to moderate erosion with less than about 2 millimeters of height loss, dentists typically use composite resin bonding. This is tooth-colored material applied directly to the worn surfaces to rebuild their shape and protect the exposed dentin underneath. It’s relatively conservative and doesn’t require removing additional tooth structure.
More extensive erosion, where teeth have lost significant height or shape, may call for porcelain veneers, onlays, or full crowns. These indirect restorations are fabricated outside the mouth and then bonded or cemented in place. For the inner surfaces of teeth, which are common erosion sites in reflux, metal or composite veneers bonded to the palatal (tongue-side) surface are sometimes used. The specific choice depends on which teeth are affected and how much structure remains. Any restorative work is most durable when the underlying reflux is also being managed, since ongoing acid exposure can erode the margins around restorations and create new problems.
Managing the Source
Dental treatments protect and repair the teeth, but they don’t stop the acid. Reducing reflux frequency is essential for preventing continued erosion. Elevating the head of your bed by six inches, avoiding food within two to three hours of lying down, and identifying trigger foods (commonly citrus, tomato-based sauces, alcohol, chocolate, and high-fat meals) can reduce episodes. Losing even a modest amount of weight, if applicable, reduces pressure on the stomach valve that’s supposed to keep acid from traveling upward.
If lifestyle changes aren’t enough, acid-reducing medications can significantly lower the acidity of what reaches your mouth during reflux episodes. The goal for your teeth is straightforward: fewer episodes of acid contact and weaker acid when it does occur. Getting reflux under control doesn’t reverse existing erosion, but it slows or stops the progression, giving fluoride, saliva, and any dental work a fighting chance.