Been using them for about 4-5 years now.
What I use now is Colgate PreviDent 5000 plus a 1.1% sodium flouride formula. For a 51g tube. And costs [depending on dentist between $15-25. per tube] Only needs to be used daily, but sparingly.
It helps some? But also do consider the pain meds you are on that can leach calciums. Common from the anti-seizure meds we often take for pain.
Calcium + Vit D + Magnesium combos are also useful [per Mrs D, and also in my experiences] to help minimize damages. That I why I'm only on intermittent pain control. I like my teeth and my bones! I mite also have an asorbtion issue which the diagnosing neuro had suspected. Seems rite for me. can't speak for others tho.
There are also other major brands with similar 'prescription' pastes. Best source to find some? Your dentist! Good luck! - j