This is one of those things where you either deal with it or break up. You can tell him that you would like him to visit a dentist and that he has some plaque. Obviously, do this nicely, but be aware this will probably go over like a ton of bricks. If he goes, great. Problem is solved. If he doesn’t, this will probably drive a wedge between the two of you. Then, you have to decide whether you can get over it or if you want to leave.
if she wanted to try something more hardcore she’d say it, maybe its too early in the relationship for her to feel comfortable bringing it up.
He’s not the one for you. It’s simply an irreconcilable difference
This is one of those things where you either deal with it or break up. You can tell him that you would like him to visit a dentist and that he has some plaque. Obviously, do this nicely, but be aware this will probably go over like a ton of bricks. If he goes, great. Problem is solved. If he doesn’t, this will probably drive a wedge between the two of you. Then, you have to decide whether you can get over it or if you want to leave.