Swapping to the sugar-free version of an energy drink does very little for your enamel. The sugar is gone, but the acid that gives these drinks their sharp taste is still there, and it is the acid that dissolves the tooth surface. Energy drinks also tend to carry more acid than sports drinks, which makes the daily can a bigger issue than many people expect.
Energy drinks hold more acid than sports drinks
A drink's pH tells you how strong its acid is at the moment you test it. Its titratable acidity tells you how much acid it holds in total, and therefore how long it can keep attacking enamel before saliva neutralises it. Both matter.
A laboratory study in General Dentistry (Jain and colleagues, 2012) compared popular sports and energy drinks. The energy drinks had a titratable acidity about three times higher than the sports drinks, and enamel exposed to them in repeated short bursts lost more than twice as much weight. A sugar-free energy drink was among the five with the highest acidity. The authors found titratable acidity was a strong predictor of how much enamel dissolved.
Australian work points the same way. In an article on sugar-free products, the Oral Health Cooperative Research Centre at the University of Melbourne reported that most soft drinks and sports drinks it tested softened dental enamel by 30 to 50 per cent in the lab.
Sugar and acid cause two different problems
Decay and erosion are easy to confuse. Decay happens when bacteria in plaque feed on sugar and make acid in one spot, eventually forming a cavity. Erosion happens when acid from food or drink softens and strips the whole exposed surface of the teeth, with no bacteria involved. A sugary energy drink can cause both. A sugar-free one mostly removes the decay risk and leaves the erosion risk in place.
The same erosive process happens with reflux, when stomach acid reaches the mouth, which we cover in acid reflux and your teeth. For a broader look at what wears enamel down, see our guide to tooth enamel erosion.
It is the daily habit that does the damage
One can now and then is unlikely to matter much. Problems build when acid exposure is frequent or drawn out, so saliva never gets a chance to catch up. The patterns that tend to cause most wear are:
- Sipping one can over a long morning at a desk, on a shift or while gaming.
- Several cans spread through the day.
- Holding or swishing the drink in the mouth.
- Drinking just before bed, when saliva flow drops.
If you have these drinks, having them with a meal and finishing them in one go limits how long your teeth are exposed. Following with plain water helps rinse the acid away, and sugar-free gum can increase saliva. Brushing does not need to be delayed: a 2024 scoping review in Caries Research (Fernández and colleagues) found that brushing with fluoride toothpaste soon after an acidic drink does not add measurable wear.
For people who drink them mainly during sport, our article on sports drinks and tooth erosion looks at what studies of athletes show. Water remains the best everyday drink for teeth, and our guides to the best and worst foods and drinks for teeth and tooth-friendly snacks for kids suggest easy swaps.
Signs your enamel is wearing
Erosion is often painless until it is well along. Look out for teeth that look more yellow or darker as enamel thins over the dentine, front teeth with thin, see-through edges, a smooth or shiny look where there used to be texture, small chips, and new sensitivity to cold drinks. Our article on sensitive teeth explains why thinning enamel can make teeth twinge.
Questions about energy drinks and teeth
Is a sugar-free energy drink better for my teeth?
It is better for decay, because there is no sugar to feed bacteria. It is not much better for erosion, since the acid is still there. In the Jain study, a sugar-free energy drink was among the most acidic tested.
Does drinking through a straw help?
It may reduce how much liquid washes over the front teeth, but it does not change the drink's acidity, and the back teeth are still exposed. Cutting down how often you drink makes the bigger difference.
Can a dentist repair erosion?
Enamel does not grow back, so the first step is finding and reducing the cause. Fluoride products can help protect what is left. Where wear has gone further, the dentist may discuss bonding or other ways to cover and protect exposed areas.
A check on your enamel
If you drink sports or energy drinks most days and your teeth feel sensitive or look different, it is worth having them checked. Our dentists and oral health therapists can look for early wear and suggest practical changes. Current offers are on our current deals page.
Sources
- Jain P, Hall-May E, Golabek K, Agustin MZ. A comparison of sports and energy drinks: physiochemical properties and enamel dissolution. General Dentistry, 2012. PubMed 22623458.
- Oral Health Cooperative Research Centre, University of Melbourne. Why those sugar-free products damage your teeth.
- Fernández CE, et al. Should we wait to brush our teeth? A scoping review regarding dental caries and erosive tooth wear. Caries Research, 2024. PubMed 38621371.
This article is general information and not a substitute for personalised advice from your dentist.
