I have heard of medicine affecting teeth to cold/hot/pressure.
My sister had Leukemia in 2000 and the chemo and/or pills she was on in that process really took a beating on her teeth. She's been off her meds since 02/03 and has noticed her teeth feel like they are stronger then before but still a little sensitive.
Don't know if I was much help, but talk to your doc and see if he can help
chatty