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I agree with Jacks answer above, and more information would be helpful to us.
Also, brushing twice a day may not be enough. Dentists recommend we also floss daily. If plaque is allowed to build up, it starts to migrate under the gums as well, and over time it does cause our teeth to loosen.
Hope that helps.
At the very least, I would say it's time to make a dental appointment to have this checked out.
None of the above medications list loose teeth as a possible side effect. I've also been reasearching RSD and there is no evidence there that loose teeth are caused by RSD. Sometimes a characteristic of those wtih RSD is teeth grinding, which could loosen your teeth over time.
Sorry I couldn't be more help,
Wish you the best,