My husband is a dentist he fixes teeth
He is in a great career field we need dentist to prevent and do treatments for oral cavity.
Yes he also treats gum disease
Gum disease is not a good sign it can also lead to halitosis it is bad breath and odor I know your husband don't like encounters with that lol.
No he does not lol its a hard job and he works long hours
I would get lonely with him being away for long hours even though he is supporting aids and providing health services.
Yes and its expensive to have a private practice with equipment and insurance costs
Wow he has his own practice that is awesome and great but I can see where the cost come in insurance is increasing all together even with dental surgeon and dentistry. 
Yes but he also works at a free dental clinic for kids who need it but can't afford it
That is even greater he is such an inspiration I heard of something similar it's called small smiles dental and they help children of low income families as well.