How can I bring this up with my boyfriend?

Before my boyfriend and I started dating he was my best friend, hands down. And still is. But since we started dating he's started sleeping over and just spending more time together in general. There's a few areas of concern about hygiene that have me in a really awkward spot. I've noticed he doesn't wash his hands after he goes to the bathroom, and I've also noticed he doesn't brush his teeth very often. I've tried making a point of washing my hands before meals and stuff in a more obvious matter- like in the kitchen where he can see, but still nothing. And before bed I always say that I'm going to go brush my teeth and get up to do so, but he never follows. I don't want to sound like a mom, nor do I want to embarrass him, but it just grosses me out a little. I feel super judgemental and a little guilty for feeling like this, but I just don't know how to approach it with him. Has anyone been in the same situation?