Why isn’t he brushing his teeth?

My boyfriend and I stay together over the weekend

sometimes Friday till Monday morning or just Saturday until Monday morning. He is 31 and I’m 29 we usually chill have a drink and watch a show or a movie and eat but I’ve notice that sometimes he doesn’t brush his teeth either in morning or at night. He seem me brushing my teeth and doesn’t do the same ( sometimes he does ) unless I tell him “ let’s brush out teeth” it bothers me because hygiene is everything to me but I’ve never told him anything.

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He also hasn’t gone to the dentist in forever and he says because of his insurance. I just hope he goes get a cleaning soon
Why isn’t he brushing his teeth?
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