Dreams are just subconcious thoughts. Your brain unwinding. I found that some dreams' conflicts involve a lot of personal fears or shortcomings. Health Anxiety isn't neccessarily the root of dreams being health-harming scenarios in my humble opinion, but having a certain thought in mind may play out in your dream. Even some of the smallest instances in every day life can be tied into the dream as well. You could have possibly seen something tooth-related that day in which your mind plays out a story relating a personal worry and something that is stored in the back of your mind. Dreams that cause humiliating factors are pretty common (being naked in public, smelling bad, forgetting to wash the shampoo out of your hair) as well as escape-conflicting factors such as doors not shutting right, running slowly, or extreme loss of time.
Blended together can produce some wild dreams. Is it out of the norm? Not at all. The mind stores far more than the mind can regurgitate... That's pretty deep lol.
Sorry to hear you got a bad bout in your rest that night.