T.S.
My son has a great pediatric dentist and has had to have a couple of fillings over the last few years. He has never had valium OR gas. They just DONT do it because they say the risks outweigh the benefits.
His dentist uses a local generally, but for a surface filling, my son goes without because he HATES the shot. They take a good long time to go over the procedure with him, let him sit for a few minutes next to a child who is having work done and doing great so he can watch what the dentist and techs are doing, then he hops up on his bed.
I was a little surprised by the no gas thing, but it seems to work fine, and he's totally himself after.
HTH
T.