@Meowthh
The thing is, it takes two to fix a marriage. I'm not saying that one spouse needs to dress, haircut, etc, etc to the other spouse's 'specifications', but this situation appears to do more with basic health and hygiene than wanting DH to dress and look like Chris Hemsworth (or whoever suits your fancy).
Ignoring oral hygiene is not only frankly disgusting and off-putting as far as sex is concerned, it's a health hazard as poor oral care has been linked, not to just bad breath, gingivitis, and tooth loss, but to heart disease and bone infections. During my DH's throat cancer treatment it was stressed to him how important it was that he maintain good oral health and see his dentist frequently, not just during treatment, but for the rest of his life.
My DH and I have loved each other through 'fat and thin' (more than once in our 35+ years together), but one can be overweight and still maintain good body hygiene, table manners, and dress neatly in well fitting clothes. If your DH is snaffling his food, stealing off his children's plates, and doing whatever the hell that belly button thing is, that's just disgusting. Habits like that would have put me off DH for sure. At this point DH and I are 'older' so it's even more important for us to maintain a healthy body weight so we're much more careful to keep slim, for ourselves as well as 'for' each other.
Sleep apnoea is nothing to fool around with. It can be fatal on its own and/or result in many cardiac problems DH uses a CPAP and although the fact that it has stopped his snoring is a big plus, the fact is that his sleep quality is greatly improved and some heart issues have cleared up. As far as I go, I use a mouth guard due to jaw clenching at night and I definitely clean it every morning and keep it in its case.
If you have a partner who refuses to maintain a good level of hygiene, is greedy and exhibits gross or disgusting behaviours, I'm sorry, but that exceeds the bounds of 'for better or worse' and shows that that person has little respect for the wellbeing of the partner they're doing those behaviours in front of. I think you need to have a brutally honest "shape up or I'm shipping out" discussion and then carry through.