I do not believe you can for two reasons. I do not think ebay will let you since it would be consider a body part. Also the dentist that does the extraction may not even give you your tooth back. In the old days you may have gotten them back after the extraction was done but now they are considered a bio hazard waste. Therefore, they have to be disposed of as such.
I can understand wanting to earn some extra money. But really unless you are some kind of star who would what to buy someone tooth.? I am sure you have something better you can sell that more people may need or want.
However you go about it good luck to you