Is it permissible to purchase extracted teeth from cadavers for training purposes in dental school, and what should be done with the purchased teeth if it is impermissible?

It is not permissible to sell human organs, but it is permissible to use parts of a deceased person for a legitimate purpose, such as training and medical experiments. Therefore, you may benefit from the teeth you possess for training purposes. If they are no longer needed, give them to students for free; otherwise, bury them.