Why did the dental assistant tell me i couldn't keep my wisdom teeth? what does she know?

Biohazardous waste: It sounds like you are referring to teeth that have been removed from your mouth. If you are then it is considered biohazardous waste and has to be disposed of according to osha/cdc regulations. If you are referring to teeth that are still in your mouth then you should ask your dentist.

Medical waste: Extracted teeth are considered to be medical waste and need to be disposed of properly. Also, the teeth are usually broken apart in order to extract them so all you would see is pieces of tooth.