Kick him out OR hide your crockery in your room. You shouldn't have to, but it's an option to consider if you can't afford to, or simply can't, kick him out. I used to have to do this with a housemate who insisted on using a cake of soap to wash the dishes instead of using dishwashing detergent, even when I offered to wear the cost of the proper detergent. She never said why she was so hell bent on being filthy in this respect (it confused me, as she was otherwise clean and tidy). I frequently found remains of food and drink on the dishes, and they looked terrible. There were always ants in the kitchen as a result. I ended up investing in my own crockery and cutlery and keeping it in my room, and otherwise leaving the stuff that was in the kitchen completely to her. At least it meant no more arguments over whose mess it was.

Jesus that's gross. Stop letting him use your plates. I hope you wash them before you use them. That's something that should NOT be compromised on.

The scary part is that a dog's mouth IS cleaner than a human's. So I'd be more concerned about kissing your boyfriend since he most likely doesn't brush his teeth.

Kick his disgusting ass out.

make him only use plastic plates

Start using compostable paper plates.

I would be tempted to add something bacterial to a plate he uses, but that would be so wrong;-)

Time for a new housemate, one w/o a dog!

Methinks it's time to invest in some paper plates. They're pretty awesome.

Wash all the plates with ex-lax. Hey, if he can't see anything wrong with the plates then he should be okay right?