My boyfriend has terrible teeth. I am worried. Any advice?!

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Yes they can fix it. The hole is a cavity.
And the black tooth would be rotted out. Probably root canal. I had braces for two years and where one of my bands was I wasn't able to brush my tooth good enough and my tooth rotted. They file that rotten tooth down and place a cap that is closest to his other tooth colors over so it blends it. It will be as good as new!
:D

it's usually fixable.. he has cavities and most likely he has more than the ones you can see. ( most can only be seen in xrays) hope he has dental insurance because fillings are not cheap!

These days, they can pretty much fix anything.

Tough to say without looking at them. The front one will probably just be a filling but possibly root canal. Back one if the hole is large enough could be root canal but probably just filling if he hasn't had pain. By the way, cavities are caused by different strains of bacteria in the mouth. Kissing someone with bad cavities actually puts you at higher risk of cavities because he may have worse strains of bacteria and definitely a lot more of them than you do; no joke. These are passed into your mouth. Children are most frequently first infected by their mothers so if mom has bad teeth, the child can as well. So tell him to clean up his nasty mouth, snack on sugars less, and brush better.

I'm a dentist