Do MRI/ or CT scans cause tooth breakdown like my dentist says?

NO. Your dentist uses the same type of ionizing radiation a CT scan uses when he does a panorex (albeit, a smaller dose). The magnets and radiofrequencies of MR should have no bearing on your teeth. I think your dentist is CRAZY!

I have NEVER heard of this - if it were true, there would literally be thousands of people suing the makers of these machines for their dental bills. I don't believe this is true.

a CT scan uses radiation just like the x-rays used in a dental office so I'm not sure what your dentist is getting at. an MRI doesn't use radiation. They're two totallyu different kinds of imaging machines.
Excessive radiation exposure can damage skin, bones and internal organs but it takes an awful lot for that to happen. Having had several CTs and MRIs in my life I have never heard of tooth break down or damage. My dentist has never mentioned such a thing. There are warning about certain tyopes of dental implants and MRI but thats only if a ferrous metal is in your body.
Does your dentist know that daily flouride exposure can damage your thyroid? I bet not

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