The risk from gym supplements and your teeth is acid, not protein. In an analysis of 67 beverages, covering 43 energy drinks and 24 pre-workout or sports supplementation drinks, mean pH ran as low as 3.3, and 87.5 percent of the pre-workout products sat below pH 5.5, the point at which enamel starts to dissolve. Three quarters of them were at or below pH 4.5. Sipping something like that through a 60 minute session, with a dry mouth from training, is a fairly efficient way to wear down enamel.
Key takeaways
- Enamel begins dissolving below pH 5.5, and dentine dissolves earlier, commonly cited at pH 6.0 to 6.3.
- Each one unit drop in pH increases enamel solubility roughly tenfold, so pH 4 is far worse than pH 5, not slightly worse.
- 87.5 percent of pre-workout beverages tested were below the critical pH, with mean values as low as 3.3.
- Pooled dental erosion prevalence in elite athletes was 36.5 percent, with a confidence interval running from 22.6 to 51.7.
- Exercise reduces saliva flow and buffering capacity, which removes your main defence at exactly the wrong moment.
- Unflavoured creatine monohydrate is essentially neutral. The risk sits in whatever you mix it into.
What this article covers, and what it does not
We already have separate articles on sports drinks and tooth erosion, on sports and energy drinks and your teeth, and on teeth clenching during exercise. Read those for the drinks and the jaw side of things.
This one is about the supplement shelf specifically. Pre-workouts, protein powders, mass gainers, creatine and amino acid drinks, and the sipping pattern that goes with all of them. The pattern is the part most people miss, so it gets its own section.
The number that explains the whole topic
Enamel starts to demineralise below pH 5.5. That is the critical pH, and it is the single most useful number in this field. Dentine, the softer layer underneath, dissolves at a higher pH, commonly cited as 6.0 to 6.3, which is why erosion accelerates once enamel has thinned or gums have receded and exposed root surfaces.
The scale is not linear. Each one unit drop in pH increases enamel solubility roughly tenfold. So a drink at pH 3.3 is not modestly worse than one at pH 5.3. It is in a different category altogether. That is the reason a low pH product deserves more caution than the sugar content alone would suggest.
What the testing actually found
A cross-sectional analysis measured 67 beverages, made up of 43 energy drinks and 24 pre-workout or sports supplementation drinks. Mean pH ran as low as 3.3. Of the pre-workout products, 87.5 percent were below the critical pH of 5.5 and 75 percent were at or below pH 4.5. Those numbers put most of the pre-workout shelf firmly in erosive territory.
Sports drinks have been measured repeatedly at pH 3.16 to 3.70. In laboratory work, one hour of immersion removed 1.18 to 5.36 microns of enamel, which is comparable with orange juice at pH 3.68 removing 3.24 microns. Nobody drinks orange juice for an hour straight, though, and that is precisely the problem with a pre-workout.
I should be honest about a gap. There is no verified published pH figure for protein powders or protein shakes, so I am not going to quote one. The published pH work covers pre-workouts, energy drinks and sports drinks. Flavoured protein products vary widely depending on the acidulants used, which is why a fruit flavoured whey isolate and an unflavoured casein are not the same proposition.
Protein, creatine and where the risk actually sits
Protein itself is not an enamel problem. Creatine monohydrate in its plain unflavoured form is essentially neutral and no study has isolated it as an erosion risk. What causes trouble is the carrier. A fruit flavoured pre-workout, a citric acid loaded amino drink, a sweetened mass gainer taken three times a day. The active ingredient is innocent and the delivery system is not.
Mass gainers are worth a separate mention because they are high in sugar by design. The amounts vary so widely between products that quoting a single figure would be misleading, so read the label on the one in your cupboard. What matters is that a gainer is usually taken between meals, which extends the number of acid attacks across the day rather than concentrating them at mealtimes.
Product by product
| Product | Typical pH or sugar risk | How it is usually consumed | The swap that lowers risk |
|---|---|---|---|
| Pre-workout | 87.5 percent tested below pH 5.5, and 75 percent at or below pH 4.5 | Sipped over 20 to 60 minutes before and during training | Drink it in one go over a few minutes, then rinse with water |
| Energy drink | Measured in the same analysis with mean pH as low as 3.3, usually with sugar as well | Sipped through a session or a shift | Use a straw, finish quickly, and follow with water |
| Sports drink | Measured at pH 3.16 to 3.70 | Sipped continuously to rehydrate | Plain water for anything under about an hour of moderate exercise |
| Flavoured protein shake | No verified published pH. Flavoured versions vary, sugar content depends on the product | Drunk after training, sometimes sipped over a long period | Choose unflavoured or lightly flavoured, mix with milk or water, finish in one sitting |
| Mass gainer | High sugar by design, with amounts varying widely by product | Taken between meals, often two or three times a day | Take it with a meal instead of between meals to cut the number of acid attacks |
| Creatine monohydrate, unflavoured | Essentially neutral, no evidence of erosion risk on its own | Stirred into water, juice or a pre-workout | Mix it into plain water or milk rather than an acidic drink |
| BCAA or amino drink | Usually acidic because of citric or malic acid flavouring | Sipped through an entire session, which is the worst pattern | Swap to plain water intra-workout and take aminos with a meal |
| Plain water | Around neutral, no sugar | Whenever you like | Nothing to change. This is the benchmark |
The sipping pattern is the real culprit
Total volume matters far less than contact time. Drinking a 500 mL pre-workout in three minutes gives your teeth one acid exposure that saliva can start clearing. Sipping the same 500 mL across a 60 minute session gives them an hour of continuous low pH. Same product, same calories, completely different result for enamel.
The same logic applies to a protein shake nursed at a desk over two hours, or a gainer sipped through the afternoon. If you take nothing else from this article, take that. Finish the drink, then rinse with water. It costs nothing.
Training gives you a dry mouth at exactly the wrong time
Saliva is the reason most of us are not eroding our teeth constantly. It buffers acid, clears it away, and delivers calcium and phosphate back into softened enamel. Exercise reduces unstimulated salivary flow and buffering capacity through several routes at once. Dehydration, sympathetic vasoconstriction of the blood supply to the salivary glands, raised vasopressin, and plain water loss from heavy mouth breathing. Salivary viscosity also rises after intense exercise, so what saliva you have moves less effectively.
Put those two things together and you have the mechanism. An acidic drink is arriving at the moment your defence system is at its weakest, and that combination is more damaging than either factor alone. If your mouth is regularly parched during and after training, our article on dry mouth, its causes and treatment covers what helps. The erosion process itself is set out in our guide to enamel erosion, its causes and prevention.
What we see in athletes
A systematic review and meta-analysis of elite athletes found pooled dental erosion prevalence of 36.5 percent, with a 95 percent confidence interval from 22.6 to 51.7. That interval is wide, which tells you how much the individual studies disagreed. The same review found caries in 44.4 percent, gingivitis in 41.4 percent, periodontitis in 10.8 percent and orofacial trauma in 15.6 percent. Among athletes screened at the London Olympic Games, 44.6 percent had dental erosion.
For gym populations specifically, a cross-sectional study in Riyadh of about 200 non-smoking men found bodybuilders had more decayed teeth, 4.47 compared with 0.89, and a higher DMFT score, 8.75 compared with 4.58, than non-bodybuilders. That is a striking difference, and it is also a single non-Australian cohort of modest size, so I would treat it as a signal rather than a settled fact.
The wider caution is the same across all of this work. These are cross-sectional studies. They photograph a moment and cannot prove cause. They are confounded by overall diet, by sports drinks, by reflux, which is more common in heavy lifters, and by how often people brush. No study has isolated any single supplement as the culprit. What the data support is a pattern, not a verdict on any one product.
Clenching under the bar
Acid is only half of it. Bruxism prevalence among athletes has been reported anywhere from 15 to 70 percent depending on the sport, with weightlifting among the highest at around 50 percent. Acid softens enamel and clenching then grinds the softened surface away, which is why the two together do more damage than either alone.
There is a genuine tension here. A systematic review found athletes with bruxism showed reduced strength, endurance and coordination, while deliberate jaw clenching during a lift raised peak torque and power. So the technique that helps a heavy set may be the same one that is wearing your molars flat. That does not mean stop clenching mid lift. It means get the wear looked at, and consider a properly made guard if it is progressing.
A practical routine that does not ruin your training
- Drink plain water during the session. Save the flavoured product for before or after, and finish it quickly.
- Rinse with water straight after anything acidic. Do not brush yet.
- Wait about an hour before brushing after an acidic drink, because softened enamel abrades more easily.
- Chew sugar free gum after training to push saliva flow back up.
- Use a fluoride toothpaste twice daily and spit rather than rinse, so the fluoride stays on the teeth.
- Mix unflavoured creatine into water or milk rather than into a pre-workout or juice.
- Mention your supplement routine at your check up. It changes what your dentist looks for.
Common questions
Does protein powder damage your teeth?
Protein itself does not. There is no verified published pH for protein powders, so anyone quoting a precise number is guessing. The risk depends on the flavouring, any added sugar, and how long you spend drinking it. An unflavoured powder mixed with milk and finished in one sitting is a low risk habit.
Is creatine bad for your teeth?
Unflavoured creatine monohydrate is essentially neutral and no study has identified it as an erosion risk. The problem is what people stir it into. Creatine mixed into juice or a pre-workout carries the acid risk of that carrier, so mixing it into plain water or milk removes the issue entirely.
Should I brush my teeth after a pre-workout?
Rinse with water immediately, then wait about an hour before brushing. Acid temporarily softens the enamel surface, and brushing it while it is soft removes more mineral than leaving it alone. Sugar free gum in that waiting hour helps saliva do the repair work.
Are BCAA drinks acidic?
Most flavoured amino drinks are, because citric or malic acid is used for taste. The bigger issue is that they are designed to be sipped through an entire session, which maximises contact time. If you want aminos, take them with a meal and drink plain water while you train.
Do I need a mouthguard for weight training?
Not for protection from impact, but a guard can be worth considering if you are clenching hard and showing wear. Reported bruxism rates in weightlifting sit around 50 percent, and clenching on acid softened enamel accelerates the damage. Have the wear assessed first, because the answer depends on how much has already happened.
If you train seriously and use supplements, it is worth having your enamel checked before wear becomes something that needs restoring rather than monitoring. The team at Lumi Dental in Melrose Park can look for early erosion patterns, check for clenching wear and talk through what to change in your routine. New patients can see what is currently available on our current deals page.
This article is general information only. It is not personal dental or medical advice, and it cannot account for your own history, medicines or examination findings. Please see a dentist or your doctor about your own situation.
