There may be legal and ethical issues that are associated with buying or selling used dentures. Legally, it is prohibited by law in many countries to sell used dentures. Ethically, selling used dentures is considered by many as exploitative or disrespectful to the dignity of the previous owner. Additionally, it's a health hazard. Used dentures can spread viruses and diseases and cause other problems. It is wiser to avoid buying used dentures and to have new ones made specifically for you by a dental professional.