Stinky Breath = Low Sex Appeal

My boyfriend's dental hygiene isn't the best.
Mainly, because he didnt go to the dentist much as a child or get nagged at by his mother as i did (i'm guessing,)
But anyways.
Its an enormous turnoff for me to have smelly breath.
Every time we go to have sex, he'll start kissing all over me (you know, the wet slobbery kisses,) and before you know it I smell his breath on me.
Most of the time, i've already showered, too. So it reaks and i'm supposed to be clean.
So I'll try to be pollite, you know, "Hey could you maybe not be so sloppy with those kisses?" Because i'm not really in to smelling like what he had for dinner a few hours ago, but then he goes into a rage and then just lays on me like a puppet.
That irks me even more, so we end up arguing about how he has poor dental hygiene and if he'd just brush his teeth daily it'd fix it.
But he won't. And its ruining our sex life. I know i sound ridiculous, but really. I feel like he should care enough about that just to stop being so lazy and brush his teeth. It takes two minutes!
What can i do to fix this?🙄