It's called "The Teeth of Steel spell"
I saw that one work. I am not going to say how. It is protective, of course.
Honestly, there are measures that can be taken to slow down the decay and prevent infection. I know someone with a mouthful of teeth who should not have any. That is one example. In his case, there is nothing that can be done with dentistry. If that is not an option, then magic might work to keep things from deteriorating.
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