My dentist said that during my root canal treatment, i had a lot of little treasures. what does this mean?

Ask your dentist: I have never heard that term used to describe any dental procedure.

Pulp Stones: I would bet the doctor was talking about pulp stones. They are very common and are found in the nerve spaces of a tooth. Just another way the body tries to protect an injured area. Although many nerves have pulp stones without any damage to a tooth. Once again, not to worry. The sometimes make it a little challanging when doing a root canal would be the worst.