Vapes are often marketed as the clean alternative to cigarettes, and for the lungs of a long-term smoker who switches completely, they may well be the lesser harm. For the mouth, the picture is less flattering. Research so far links vaping with more gum inflammation than in people who do not use nicotine at all, and with a dry mouth that leaves teeth more exposed to decay, although the long-term evidence is still young.
This article sets out what the studies reasonably support, where the evidence is still weak, and what you can do to protect your teeth if you vape.
Gums take the clearest hit
Gum health is where the evidence is most consistent. A 2025 systematic review in the International Dental Journal (Alkattan and colleagues) pooled ten studies and found that people who use e-cigarettes generally had more signs of gum disease, such as deeper gum pockets and more plaque, than people who did not smoke or vape. Cigarette smokers tended to fare worse again. So vaping sits in the middle: better than smoking for the gums, but clearly not the same as using nothing.
Most vapes contain nicotine, which narrows blood vessels. In smokers this is known to reduce the bleeding that usually warns of gum inflammation, and the same effect is a concern with nicotine vapes. Gums that look calm can still be losing attachment underneath. If your gums do bleed when you brush, our guide to bleeding gums explains what it can mean.
A dry mouth leaves teeth less protected
Many people notice their mouth feels dry after vaping. The base liquids in e-liquids, propylene glycol and glycerin, attract and hold water, which is one reason this is thought to happen. Saliva matters more than most people realise: it neutralises acid after eating, washes away food and bacteria, and carries minerals that help repair early damage to enamel. With less of it, the risk of decay, sensitivity and bad breath goes up. Our guide to dry mouth covers ways to manage it.
The link with decay is still uncertain
Sweet flavours and a drier mouth sound like a recipe for tooth decay, and some studies have found more decay in people who vape. But the evidence is thin. A 2025 meta-analysis in Archives of Oral Biology (Fernandez and colleagues) found only four suitable studies, most with a high risk of bias, and rated the certainty of the evidence as very low. When the researchers pooled the adult data, they did not find a significant difference in decay history between people who did and did not vape. The sensible reading is that a link is plausible but not proven, and regular check-ups will show what is happening in your own mouth.
Irritation and the soft tissues
People who vape often report a sore or irritated mouth or throat. Some substances in vapour have shown potentially harmful effects on cells in laboratory studies, but there is not yet enough long-term human data to put a figure on any oral cancer risk the way there is for smoking. That uncertainty is a reason for caution rather than reassurance. Any ulcer, sore or patch in the mouth that has not healed or changed within three weeks should be checked by a dentist or GP, and a look at the soft tissues is part of a routine check-up. Our article on oral cancer screening explains what that involves.
Switching from cigarettes is not the same as starting fresh
For a smoker who moves completely to vaping, the mouth is likely to be exposed to fewer of the harmful substances in tobacco smoke, and staining from tar is usually reduced. In that narrow sense it may be the lesser harm. For someone who has never smoked, though, taking up vaping adds risks to the gums and teeth that were not there before. For your mouth, the healthiest option is neither. People who smoke and are planning implants may find our guide to dental implants and smoking risks useful.
Looking after your mouth if you vape
- Sip water often through the day, especially while vaping.
- Chew sugar-free gum to encourage saliva.
- Brush twice a day with fluoride toothpaste and clean between your teeth every day.
- Tell your dentist or OHT that you vape so they know to look closely at your gums.
- Keep up regular check-ups so early changes are picked up.
If you would like to stop, Quitline (13 7848) supports people quitting vaping as well as smoking, and your GP can help too. In Australia, since 1 July 2024, tobacconists, vape shops and convenience stores can no longer sell vapes under Therapeutic Goods Administration rules, and therapeutic vapes are available from pharmacies only when clinically appropriate, so a pharmacist is another point of contact.
Common questions
Will vaping stain my teeth?
Usually less than smoking, since there is no tar. Some discolouration can still happen, particularly with dark or strongly flavoured liquids.
Is a nicotine-free vape safe for my teeth?
Removing nicotine takes away its effect on blood flow to the gums, but the base liquids can still dry the mouth and flavourings can irritate it. It may be lower risk, but it is not no risk.
Should parents worry about teenagers vaping?
Yes. Nicotine is highly addictive, and the long-term effects of vaping on a young mouth are unknown. The safest choice for young people is not to start.
If you vape and would like your gums and teeth checked, our team at Lumi Dental in Melrose Park provides relaxed, non-judgemental care. Book a check-up with our general dentist team or see current offers.
