T.D.
Thought I would comment on this since I went through this with my daughter. She turned 3 last October, and just started getting her last eye tooth in January. We were told at her 3 year check up that it didn't even feel like there was a tooth up there. Our pediatrician told us that we could take her to a pediatric dentist and have it x-rayed, but if she is missing that tooth, then there isn't anything can do for her right now. So we opted to wait it out, and surprise, it eventually came. Just be patient, as I said, they can't do anything if he is actually missing the tooth until they are older.