I do have some gum recession, and a lot of fillings. My wife has better dental health, even though she gives her teeth less attention than me in terms of hygiene. But I've also found articles online about spreading cavities. Here is an example.

> Dental caries, commonly known as tooth decay, is the single most common chronic childhood disease. In fact, it is an infectious disease. Mothers with cavities can transmit caries-producing oral bacteria to their babies when they clean pacifiers by sticking them in their own mouths or by sharing spoons.

https://www.sciencedaily.com/releases/2014/02/140220112402.h...