Hygiene problems

I feel like lately my husband has been getting more and more hygiene problems. Like he will only shower like 2 times a week and brush his teeth the same-only when he showers. It’s so gross and I tried to tell him that in the nicest way I could think of and he just got upset. I think maybe hes depressed or something… idk. We are visiting his family for a week for a bday and then going back home. I thought everything was good. We both have jobs that we love, family and friends that we love, a beautiful home, and his dog that he loves.