This is all true except that it’s impossible for some people to have perfectly white teeth. Unlike with weight, genetics can genuinely play a role in making some people’s teeth naturally more yellow, and perfect whitening procedures to counteract that cost a lot. I get what you mean though, everyone should brush their teeth to avoid getting the really really nasty yellow teeth but not everyone can have that perfect white smile
I can happily dm you three different links. The weight gain occurs due to the correlation between PCOS and insulin resistance. Most people do not identify how to combat these issues and in turn gain weight from it. Now again, slight weight variation is completely fine. However, if your belly is hanging to your knees you have a problem. Someone in your life should be honest if you have said problem.