Needing advice *dental hygiene*

Hi all, I’m having some serious germy issues with my boyfriend at the moment we have been together 3 +years and he flat out will NOT brush his teeth, they are so bad they are constantly yellow, he brushes them once every two months maybe once a month if I’m lucky, it’s gotten to the point where I will not kiss him it’s awful and killing my desire for him. He thinks that because his dad never brushed his teeth that you don’t need to because his dad still has teeth and ‘they are fine’ he said. He’s 19 years of age and won’t brush his teeth without an argument and won’t wash his hair either. I’m literally considering leaving.. this guy wants to have kids and he can’t even brush his own teeth????