Acid Reflux and Dental Erosion:
Could Stomach Acid Be Harming Your Teeth?
Unexplained tooth wear, enamel loss, or sensitivity can be a hidden sign of acid reflux reaching your mouth — even when you have no obvious heartburn. Dental erosion from reflux is permanent, but identifying reflux early means it can be treated before further damage occurs.
Simple home saliva test · No GP referral required · CE-IVD certified diagnostic
How Acid Reflux Reaches Your Teeth
Tooth enamel — the hardest substance in the human body — cannot repair itself once lost. When acid from the stomach reaches the mouth, it attacks enamel in a process called demineralisationiThe process by which acid dissolves the calcium and phosphate minerals from tooth enamel, leaving it soft, thin, and vulnerable to further damage.: the acid dissolves the calcium and phosphate that give enamel its strength, leaving teeth soft, thin, and vulnerable.
For most people, occasional acid exposure is buffered by saliva. But when reflux is persistent — whether as classic GERD or the less obvious silent reflux (LPR) — the acid arrives repeatedly, faster than saliva can neutralise it. The result is cumulative, progressive enamel loss that looks nothing like normal wear.
What makes reflux-related dental erosion particularly deceptive is that it often occurs without any awareness of reflux. Patients with silent reflux (LPR) frequently have no heartburn at all — their reflux reaches the throat and mouth but doesn't trigger the burning sensation most people associate with acid indigestion. Dentists are often the first clinician to raise the possibility.
Night-time is particularly damaging. During sleep, swallowing reflex slows, saliva production drops, and lying flat makes it easier for stomach contents to reach the oesophagus and beyond. Acid that refluxes while you sleep can sit in contact with your teeth for extended periods with nothing to buffer it.
Warning Signs — What Dentists See and Patients Notice
Acid reflux-related erosion has a distinctive pattern that experienced dentists can identify — and patients can learn to notice too. The location of the erosion is the key diagnostic clue.
Palatal surfaces of upper incisors
The first and most characteristic site. The backs (tongue-side) of the upper front teeth are attacked earliest because this is where refluxed acid pools after passing over the tongue. The surfaces appear smooth, glazed, or concave — a classic sign of acid erosion rather than mechanical wear.
Posterior occlusal surfaces
In a secondary stage, the biting surfaces of the back teeth (molars and premolars) begin to erode. Cusps appear flattened, rounded, or cupped. Fillings may appear to "rise" as the surrounding tooth structure dissolves away around them.
Sensitivity — especially to cold and sweet
As enamel thins, the dentineiThe layer of tooth tissue directly beneath enamel. Softer and more porous than enamel, it contains tiny nerve channels — which is why its exposure causes sharp sensitivity to cold and sweet foods. underneath becomes exposed . Patients often notice sharp sensitivity to cold drinks, ice cream, or sweet foods. This is one of the earliest patient-reported symptoms that prompts a dental visit and may flag erosion before it is visually obvious.
Worse in the morning
Patients with reflux-related erosion often notice that their teeth feel rough, sensitive, or "different" first thing in the morning — consistent with acid exposure occurring overnight during sleep. Morning symptoms that ease during the day are a strong indicator that night-time reflux is involved.
Thinning and translucency of front teeth
The incisal (cutting) edges of the front teeth may become thin, translucent, or chipped more easily than expected. This gives teeth a worn, slightly see-through appearance at the edges — often noticeable in photographs or when light catches the teeth at an angle.
Pattern inconsistent with dietary acid or grinding
A key diagnostic indicator is that the erosion pattern doesn't match other causes. Dietary acid (fizzy drinks, citrus) tends to affect the labial surfaces. BruxismiThe medical term for tooth grinding or clenching, often occurring unconsciously during sleep. It produces mechanical wear rather than acid dissolution, leaving a different erosion pattern to reflux damage. (grinding) produces a different wear pattern. When the palatal and posterior pattern appears in a patient who doesn't drink much acid, reflux becomes the leading explanation.
Why Pepsin Matters — And What It Actually Tells You
PepsiniA digestive enzyme produced exclusively in the stomach lining. Its presence in saliva is direct evidence that stomach contents have refluxed upward — it cannot arrive there any other way. is a digestive enzyme produced exclusively in the stomach. Under normal circumstances it stays there. When reflux occurs, pepsin travels up alongside stomach acid and can reach the throat, mouth, and beyond. Detecting pepsin in saliva is therefore direct evidence that gastric contents are refluxing to the upper airway — which is exactly what Peptest measures.
The relationship between pepsin and dental erosion is clinically important but requires careful framing. Pepsin itself does not directly erode tooth enamel — the pepsin molecule is too large to penetrate enamel at the molecular level. It is acid that causes demineralisation. So pepsin in saliva is not the direct mechanical cause of dental erosion.
What pepsin is, however, is a highly specific marker that reflux is occurring and reaching the mouth. Salivary pepsin is detectable only if gastric contents have refluxed. Its presence confirms that the patient is experiencing the same reflux episodes that are bringing acid into contact with their teeth. Research has confirmed salivary pepsin as an independent risk factor for dental erosion.
This distinction matters clinically. If a patient has dental erosion and pepsin is detected in their saliva, the appropriate response is not to "treat the pepsin" — it is to investigate and treat the underlying reflux disease before further enamel is lost. Pepsin serves as the diagnostic signal that unlocks the referral pathway.
Gastric contents are reaching the mouth. Reflux is occurring at a level that brings acid into contact with the teeth — regardless of whether the patient has heartburn or any other symptom.
Pepsin does not penetrate enamel or cause demineralisation directly. Acid is the direct cause of erosion. Pepsin is the marker — acid is the mechanism of damage.
Detecting pepsin in a dental patient confirms reflux is occurring, enabling early referral to a gastroenterologist before further irreversible enamel loss takes place.
Pepsin also causes direct tissue damage in the throat and upper airway through a different mechanism — endocytosisiA process where cells actively absorb external molecules. In LPR, throat cells can internalise pepsin this way, allowing it to cause tissue damage from within — independent of acid., where cells actively take up pepsin and it damages structures from within, independent of acid. This is the mechanism behind many LPR symptoms including chronic cough and hoarseness. Read the full pepsin science →
The Research Base: GERD, Acid Reflux and Dental Erosion
The association between gastric reflux and dental erosion is one of the most consistently replicated findings in dental medicine — supported by multiple systematic reviews, meta-analyses, and the BDJ's own guidance to clinicians.
Dental erosion is present in over half of GERD patients
The largest pooled analysis to date — 28 studies involving 4,379 people — found dental erosion in 51.5% of GERD patients compared to 21.4% of controls. GERD was associated with a fivefold increased risk of dental erosion (OR 5.0, 95% CI: 2.99–8.35).
A 2023 overview of 10 systematic reviews (Chatzidimitriou et al., Journal of Dentistry) confirmed that GERD is a risk factor for erosive tooth wear, concluding that individuals with GERD have an increased probability of presenting with signs of erosion and that a multidisciplinary medical and dental approach is warranted.
The mechanism: acid and pepsin together
The BDJ's 2023 clinical review describes gastric juice — the source of intrinsic erosion — as containing both hydrochloric acid and the digestive enzyme pepsin. Acid is the direct agent of enamel demineralisation. Pepsin's role is the removal of protective dental pellicleiA thin protective film of proteins that forms naturally on tooth surfaces from saliva. It acts as a barrier against acid attack. Pepsin degrades this film, leaving enamel more exposed to erosion., compounding the erosive damage. Detecting pepsin in saliva via Peptest confirms that gastric contents — acid included — are reaching the mouth.
Why Peptest is relevant to your dental patients
Silent reflux patients — those without heartburn or obvious digestive symptoms — cannot self-report a reflux history because they are unaware of it. Visual erosion scoring tells you that damage has occurred; it cannot confirm the cause. Peptest provides objective, non-invasive confirmation that reflux is actively reaching the mouth, giving you the evidence to support a GP referral and appropriate treatment before further enamel is lost.
What Happens If Reflux-Related Erosion Is Left Untreated
Because erosion is painless in the early stages and progresses slowly, it is often not taken seriously until significant enamel loss has already occurred. At that point, the dental consequences are serious — and irreversible.
Many patients don't notice erosion until their dentist points it out — by which point enamel loss is already permanent.
Enamel thinning and early sensitivity
The outer enamel layer begins to dissolve. Teeth may feel slightly rough or sensitive to temperature changes. Visually, the teeth may look normal — erosion at this stage is only detectable by a dentist using specialised scoring. This is the ideal intervention point.
Dentine exposure and increased sensitivity
Once enamel has worn through, the softer dentine beneath is exposed. Sensitivity intensifies significantly. Teeth may appear yellower (dentine is naturally more yellow than enamel) and the characteristic concavities and cupping become visible on examination.
Structural damage requiring restoration
Advanced erosion compromises tooth structure. Teeth crack, chip, or fracture more easily. Restorations — crowns, veneers, composite bonding — become necessary to restore shape and function. These are costly, time-intensive, and require replacement over a lifetime.
Pulp involvement, root canals, and tooth loss
In severe cases, erosion reaches the pulp (nerve) of the tooth, causing significant pain and requiring root canal treatment. In the most advanced cases, teeth cannot be saved and must be extracted. Reflux-related erosion, caught too late, can result in full-arch reconstruction.
Enamel does not regenerate. Unlike bone, tooth enamel has no living cells to repair itself once it has been dissolved. Every episode of acid exposure contributes to a loss that is permanent. Treating the underlying reflux does not restore lost enamel — it only prevents further loss from occurring. This is why early identification of reflux in dental patients matters.
What to Do If You Suspect Reflux Is Damaging Your Teeth
Test for reflux with Peptest
Peptest is a non-invasive, at-home saliva test that detects pepsin — the key marker of gastric reflux reaching the mouth. You collect three saliva samples at home and return them to our UK laboratory. Results are returned within 48 hours. No GP referral required. If reflux is confirmed, you have objective evidence to present to your dentist and GP.
Order Peptest — £79.95Speak to your dentist about reflux
If you have noticed sensitivity, unusual wear, or your dentist has mentioned erosion, raise the possibility of reflux. Show them where the erosion is occurring — palatal surfaces and posterior occlusal sites are the pattern to discuss. Many dentists are experienced in identifying reflux-related erosion and can refer you to a gastroenterologist if needed.
Seek treatment for the reflux — not just the erosion
Restorative dental work (veneers, crowns, bonding) can repair visible damage, but it will not stop further erosion if the underlying reflux continues. Treating the cause — through diet, lifestyle, alginate therapy, or appropriate medication — is the only way to halt progression. Read our LPR treatment guide or discuss GERD treatment options with your GP.
Protect teeth while managing reflux
While addressing the reflux itself, there are measures that reduce acid contact with teeth: avoid brushing immediately after reflux or a meal (enamel is softened and brushing causes additional abrasion); drink water to rinse the mouth; use fluoride toothpaste; and consider a high-strength fluoride product if your dentist recommends one.
Are You a Dental Professional?
Peptest is used by dentists alongside gastroenterologists to investigate the reflux–erosion relationship in patients presenting with unexplained tooth wear. If you are interested in incorporating Peptest into your practice workflow, or wish to learn more about the clinical pathway for referring reflux-positive patients, we would be glad to discuss this with you.
We also have information available about our dental practice partnership programme for practices that wish to recommend or offer Peptest directly to patients.
Frequently Asked Questions
Yes — and this is one of the most clinically important points. Silent reflux (laryngopharyngeal reflux, or LPR) occurs when stomach contents reflux into the throat and mouth without producing the chest-burning sensation most people associate with acid reflux. Patients with LPR frequently have no awareness of reflux at all. Yet the acid reaching the mouth is just as damaging to enamel as acid from heartburn-producing GERD. Dental erosion may be the first and only clinical sign that silent reflux is occurring.
The location and pattern of erosion is the key differentiator. Reflux-related erosion characteristically affects the palatal surfaces of the upper incisors (the backs of the upper front teeth) first, then the posterior occlusal surfaces. Erosion from dietary acid (fizzy drinks, citrus) tends to affect the front-facing (labial) surfaces. Bruxism (tooth grinding) produces a different wear pattern, typically on the biting surfaces with a flattened appearance. A dentist experienced in erosion assessment will look at the pattern, location, and shape of the wear to determine the most likely cause. Peptest can provide objective confirmation of whether reflux is occurring.
A mouthguard protects teeth from the mechanical force of grinding, but it does nothing to stop acid. If your tooth wear is being driven by acid reaching the mouth from reflux, a guard alone won't address the cause — and the erosion can continue underneath it. Confirming whether reflux is involved means the underlying problem is identified and managed, not just covered. In some people, night-time reflux may even be contributing to the grinding itself, so treating the reflux can help on both fronts.
No — enamel does not regenerate once lost, so erosion that has already occurred is permanent. However, successfully treating the underlying reflux will halt further erosion. This is why early identification is so important: the sooner reflux is confirmed and treated, the less enamel is lost. Dental restoration (composite bonding, veneers, crowns) can then address the cosmetic and structural damage that has already occurred. Managing the reflux and restoring the damage are complementary — but treating the cause must come first to prevent restoration failure.
Peptest is a CE-IVD certified home saliva test that detects pepsin — an enzyme produced exclusively in the stomach. If pepsin is found in a saliva sample, it can only have arrived there via reflux, confirming that gastric contents are reaching the mouth. The test involves collecting three saliva samples at home (typically on waking, upto 1 hour after a meal, and following any symptomatic episode) and posting them to our UK laboratory. Results are returned within 48 hours by email. No GP referral is needed. A positive result gives both the patient and their dentist objective evidence that reflux is occurring, which can then guide referral to a gastroenterologist and appropriate treatment.
No — this is one of the most important practical points for protecting teeth affected by reflux. Immediately after an acid exposure (whether from reflux or diet), enamel is temporarily softened. Brushing at this moment accelerates the physical removal of softened enamel. The recommended approach is to rinse thoroughly with water to dilute and clear the acid, then wait at least 30–60 minutes before brushing. Using fluoride toothpaste regularly helps strengthen enamel between episodes. Your dentist may also recommend a high-fluoride prescription toothpaste if erosion is already present.
No — this is an important distinction. Pepsin does not directly cause enamel erosion. The pepsin molecule is too large to penetrate enamel at a molecular level, so it does not contribute to demineralisation in the way that acid does. Acid is the direct agent of enamel dissolution. Pepsin's clinical value in the dental context is as a biomarker: its presence in saliva confirms that reflux is occurring and bringing acid into the mouth. Salivary pepsin has been identified as an independent risk factor for dental erosion in the research literature — not because it causes erosion directly, but because it reliably indicates that the acid-producing reflux events that do cause erosion are happening.
Find Out Whether Reflux Is Affecting Your Teeth
A single Peptest provides objective evidence of whether gastric reflux is reaching your mouth — the information your dentist and GP need to act. At-home collection, UK laboratory analysis, results within 48 hours.
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