My co worker has straight gum rot, like a few millimeter layer where the gums meet their teeth that's all whiteish green and they have horrendous breath I can smell 15 feet down wind of the AC system. This is due to their horrible personal hygiene, he has a wife with good teeth, I don't know how she kisses him, I would vomit.
He's only in his early 30's and also just had to get one of his K9 teeth pulled out.
It seems like sometimes women (in specific) start with these crazy high expectations, but then start lowering them during the relationship, and never stop lowering them.
There absolutely is such a thing as being too accepting of bad behavior from a partner. That's just healthy boundaries. Letting your gums rot probably should be outside that scope, if they can help it at all.