What should i do if my husbands tooth came out with the entire root and hes a diabetic?

Needs to see dentist: Oral health and control of diabetes are connected. Teeth should not just fall out. There is something going on here, like an infection and gum disease that needs to be evaluated by a dentist and treated by a dentist. Once his mouth is healthy he may find that controlling his blood sugar is easier. And because he is a diabetic he is at higher risk of an infection. So get him to a dentist soon.