The British Dental Journal says that half of elite athletes have rotting teeth.

352 Olympic and professional athletes were examined and showed higher than usual rates of dental problems despite the fact that they brushed and flossed more than your average person.

Researchers hypothesise that is is the high intake of sugary sports drinks, gels and bars that may be the culprit whilst the intense exercise may also cause changes to saliva and the immune system that may be related.

https://www.telegraph.co.uk/science/2019/08/23/extreme-fitness-rots-teeth-new-study-finds/

https://www.nature.com/articles/s41415-019-0617-8