Is it true that if your take so called "bone builders" but don't take in enough Calcium and Vit D - that it will "rob" your system {teeth etc} of the available calcium to support the bones?

My mom took one of the bone builders for a few yrs and now her teeth seems to be cracking and breaking often.
She doesn't chew ice cubes or anything that would normally cause tooth breakage.
Although she was on Prednisone for yrs about 10 yrs ago.
due to a severe rare illness.

I"m assuming the pred caused the soft bones and that led to the bone builder... but maybe the pred also caused the teeth to get soft too...???

Just wondering...