I am a dentist and just started vaping to quit smoking. I've learned so much from this site about vaping its nice to be able to contribute something for once .
Like ^ said, the problem is most likely from dry mouth. Saliva is a natural buffer, keeping the pH in your mouth slightly higher (less acidic). When you have dry mouth the pH drops and this makes it much easier to get cavities. Do NOT fix your dry mouth by drinking anything surgery. I'm not saying never drink a coke. The problem comes when you are continuously sipping on surgery/acidic drinks (coke, juices...) thruout the day. Drink whatever you want during meals, but you should be sipping on water thruout the day, absolutely not anything containing sugar, to control your dry mouth.