It would be hard to say what or why. I would suggest looking for the dentist so the teeth can be examined.
Bunch of factors which may influence "loose teeth". It is after all a such a broad explanation. It can be trauma, it can be family history of periodontitis. It may depend on how many times you brush your teeth a day, floss, diet, are you going through chemotherapy or something similar. What about your medications? The list goes on.
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