Acid Erosion: The Tooth Damage You Cannot Undo

📖 13 min read  ·  Updated 28/07/2026

What Acid Erosion Actually Is — And Why It Is Not Decay

Most Australians have one mental model for tooth damage: holes, drills, fillings. Cavities. That model is about decay, and decay is a bacterial disease. Acid erosion is a completely different process, and confusing the two is why so many people do all the right things and still lose their teeth.

Decay works like this: bacteria living in dental plaque ferment sugars from your food and excrete acid as a waste product. That acid sits trapped under the plaque, in one spot, and demineralises the tooth beneath it. It is localised. It is bacterial. It happens in the grooves and between the teeth, where plaque hides.

Erosion needs no bacteria at all. It is direct chemical dissolution. When an acidic liquid washes over a tooth, hydrogen ions from that acid strip calcium and phosphate out of the enamel surface and carry them away. The mineral goes into solution. It leaves the tooth. That is the whole mechanism. It is chemistry, not biology.

Because of that, erosion does NOT look like decay. It is not a hole in one spot. It is generalised, smooth, and it appears wherever the acid actually flows — across the biting edges, over the front surfaces, on the tongue-side of the upper front teeth if the acid is coming from the stomach. A tooth with erosion can be perfectly free of cavities and still be dissolving.

Enamel Does NOT Grow Back — The Biology Behind The Bad News

Enamel is the hardest substance in the human body. It is also, biologically speaking, dead.

The cells that build enamel are called ameloblasts. They lay the enamel down while the tooth is still forming inside the jaw, and then — this is the critical part — they die off and are lost when the tooth erupts into the mouth. They are never replaced. Adult enamel is acellular: no cells, no blood supply, no nerve, no capacity to heal. Skin repairs. Bone remodels. Enamel does NOT.

So when acid dissolves a layer of enamel away, there is no biological process anywhere in your body that can put it back. It is gone permanently. That is why erosion is described clinically as an irreversible loss of dental hard tissue.

Remineralisation Is Real — But It Is Not Regrowth

Here is the distinction almost every article on the internet gets wrong, and it is the difference between useful advice and false hope.

When acid first hits enamel, it does not immediately carve a crater. It first softens the outermost layer — pulling mineral out of the surface while the underlying protein-and-crystal scaffold is still intact. That softened layer can be re-hardened. Saliva is naturally supersaturated with calcium and phosphate, and it will push those minerals back into the softened surface over the following minutes to hours. Fluoride accelerates and strengthens this process. This is remineralisation, and it is genuine.

But remineralisation can only re-harden a surface that is still there. It cannot rebuild thickness that has already dissolved away and been swallowed. Once the mineral has physically left the tooth, no toothpaste, no mouthwash, no diet and no supplement will bring it back. Read our full breakdown here: Can You Remineralise Teeth?.

Frequency Beats Volume — The Most Useful Fact In This Article

If you take one thing away, take this. It is not how MUCH acid you consume that destroys your enamel. It is how OFTEN.

Every acidic exposure drops the pH in your mouth and opens a demineralisation window. Enamel begins to lose mineral below roughly pH 5.5, and erosive dissolution of the surface accelerates sharply as drinks fall below about pH 4.0 — which most soft drinks, sports drinks and energy drinks comfortably do. Your saliva is the defence. It dilutes the acid, buffers the pH back towards neutral, and then redeposits mineral into the softened surface. That recovery takes time — typically in the order of 30 to 60 minutes after a single exposure.

Now do the arithmetic. Drink a 375 mL can in five minutes and your mouth takes one acid hit, then spends the next half hour recovering. Sip that same single can slowly across a two-hour afternoon at your desk and you are not taking one hit — you are topping the acid up before saliva has ever finished buffering the last mouthful. Your teeth sit below the critical pH for two straight hours. Same volume. Same sugar. Vastly more damage.

The same logic condemns the water bottle full of cordial on the desk, the sports drink nursed through a 90-minute training session, the sour lolly eaten one at a time over an hour, and the lemon water sipped all morning. Each of these looks moderate. Each of them keeps the mouth acidic almost continuously.

The counter-move is equally simple. Consolidate your acid. Drink acidic drinks quickly rather than slowly, and preferably with a meal — chewing a meal drives a surge of saliva flow, which buffers the acid faster than saliva at rest ever could. Then leave your mouth alone and let it recover.

Sugar-Free Does NOT Mean Safe For Your Teeth

This is the point that genuinely shocks people, so read it slowly: the diet, zero-sugar and sugar-free versions of soft drinks erode enamel too.

Sugar is what bacteria ferment. Remove the sugar and you meaningfully reduce your decay risk — that part is real. But erosion does not need bacteria and does not need sugar. It needs acid. And the acid in a cola is not the sugar; it is phosphoric acid and citric acid, deliberately added for tartness and shelf stability. The sugar-free version contains the same acids at the same low pH. Chemically, as far as your enamel is concerned, it is the same drink.

The same trap catches sparkling water flavoured with citrus or 'natural fruit essence', kombucha, cordial, and most sports and energy drinks. Marketed as the healthy option, all of them are acidic. The NHMRC's Australian Dietary Guidelines (2013) advise limiting sugar-sweetened drinks including soft drinks, sports drinks and energy drinks — but from an erosion standpoint the acid load matters even when the sugar has been engineered out.

Every Dietary Acid Source, Ranked By Real-World Risk

Acidity is measured on the pH scale — lower means more acidic, and each whole point is a tenfold increase in acid strength. Water sits at pH 7. Enamel starts losing mineral below about pH 5.5. Use the table below as a working map of what is actually in your day, and note that the third column — how you consume it — usually matters more than the second.

Internal Acid: Reflux, Vomiting And Morning Sickness

Everything above is acid you chose to put in your mouth. Some of the most severe erosion dentists see comes from acid nobody chose at all.

Stomach acid is far stronger than almost anything you drink. Gastric contents typically sit around pH 1 to 3 — more aggressive than cola. When that acid reaches the mouth, the erosion it causes is fast and severe.

Gastro-Oesophageal Reflux (GORD)

In reflux, stomach contents travel back up the oesophagus. Many people with reflux feel heartburn. Many do NOT — so-called silent reflux can be doing damage in the mouth with no chest symptoms at all, particularly overnight when you are lying flat and saliva flow is at its lowest. This is one of the reasons a dentist sometimes raises the possibility of reflux before a doctor does.

Vomiting, Eating Disorders And Morning Sickness

Recurrent vomiting from any cause exposes the teeth to gastric acid directly. That includes pregnancy-related morning sickness, which can be severe and prolonged, and it includes eating disorders involving purging.

If that last sentence is about you, please read this part without judgement, because none is intended. Erosion is a physical consequence of acid contacting enamel — it is not a moral fact about anybody. It also does not have to be faced alone. Your GP is the right first step and can arrange support and referral confidentially. In Australia, the Butterfly Foundation is the national body supporting people affected by eating disorders and body image issues, and is a further avenue for help. A dentist can also help protect your teeth in the meantime — that conversation can be had discreetly, and it is a conversation dentists have regularly.

One more rule that matters more here than anywhere else in this article: after vomiting, do NOT brush your teeth. It is the instinctive reaction and it is the worst possible one. Rinse with water, or with a fluoride mouthrinse, and wait.

Do NOT Brush Straight After Acid — You Are Scrubbing Away Softened Enamel

Everyone gets this wrong, and it is doing real, cumulative, permanent damage.

Here is the sequence. You drink something acidic. The surface layer of your enamel is now chemically softened — demineralised, structurally weakened, but still physically present and still salvageable. Your mouth feels furry and acidic, which is precisely the feeling that makes people reach for a toothbrush. So they brush.

And the brush, with its abrasive paste, scrapes that softened layer straight off the tooth and spits it into the sink. You have just converted a reversible softening into an irreversible loss of thickness. Every single time you do it. The Australian Dental Association advises against brushing immediately after an acidic drink or after vomiting for exactly this reason.

The practical version: rinse, wait, then brush. And if you cannot remember the wait, simply move your brushing to before the acidic drink instead of after it.

How To Spot Acid Erosion Before It Costs You

Erosion is silent and gradual. It does not hurt in the early stages, and because it happens to every tooth at once, there is no obvious 'before and after' to compare against. By the time most people notice, years of enamel are already gone. These are the signs, roughly in the order they show up:

The final one on that list is the one to fear. If a filling is standing proud, or if you can see dentine cupping in your molars, this has already stopped being a prevention conversation and started being a restorative dentistry conversation.

What Advanced Erosion Actually Costs

Once enough enamel has gone, the tooth cannot simply be re-hardened or protected back to health. It has to be physically rebuilt with material — composite bonding, onlays, veneers, or full crowns. In severe generalised cases, where the bite itself has collapsed because every tooth has shortened, the treatment is a full-mouth rehabilitation.

That work is skilled, slow and expensive. It is also not permanent: restorations wear, chip, stain and eventually need replacing, and every replacement removes a little more tooth. The Australian Institute of Health and Welfare reports that cost is already a significant barrier to dental care for a substantial share of Australians — and restorative work for advanced tooth wear sits at the expensive end of dentistry.

That is the entire reason this article spends most of its words on prevention. Prevention is free. Restoration is not.

How To Stop Enamel Erosion — The Protocol

You cannot get back what has gone. You can absolutely stop losing more, starting today. In order of impact:

Where LACALUT Fits — And Where It Does NOT

Let us be precise about this, because precision is the whole point of the article.

No toothpaste rebuilds lost enamel. Not ours, not anyone's. That is a biological impossibility, and any brand telling you otherwise is selling you something that cannot exist. What good toothpaste does is support the enamel you still have, and manage the consequences of what you have already lost.

LACALUT is a German oral care brand founded in 1925. The products above are cosmetic oral care. They do NOT treat, cure, prevent or reverse acid erosion, reflux or tooth decay, and they do NOT rebuild enamel. If you have erosion, the things that will actually change your outcome are the acid in your diet, the reflux in your stomach, and your dentist. A toothpaste is there to support the daily care around those.

The Evidence Base

Medical disclaimer: This article is for general information only and does not constitute dental or medical advice. Acid erosion, reflux and eating disorders require assessment by a registered dental practitioner and a medical practitioner. If you are affected by an eating disorder, please speak to your GP; the Butterfly Foundation is Australia's national support body for eating disorders and body image issues.

Frequently Asked Questions — Acid Erosion Of Teeth