It's an anecdote, and the details rely on genetics, but it's hard science that tons of sugar sticking to your teeth all day is very bad for them. Some people mi

It's an anecdote, and the details rely on genetics, but it's hard science that tons of sugar sticking to your teeth all day is very bad for them. Some people might be much more resistant to cavities and decay, but that doesn't change the fundamentals of the risk and the fact that most people aren't so lucky. Also, for what it's worth, cavities don't always present with obvious symptoms like pain. Well, they are obvious, but often only to dentists/trained professionals, and x-rays may sometimes be necessary to be totally sure.