Prostho Plus is a science-fiction novel by Piers Anthony, published in 1971.

It is a humorous space opera which follows the adventures of a prosthodontist, Dr. Dillingham, who is picked up by aliens who are in need of dental work.

Complications develop when he makes a diplomatic blunder and it results in his being exiled to the Galactic University of Dentistry.

As well, he acquires the "protection" of a robot who will kill him in 50 years (for awakening it; compare The Fisherman and the Jinni).

This article about a 1970s science fiction novel is a stub.