i can almost garuntee he won't be knocked out.. and you don't want him to either... to have my teeth removed and be put to sleep to do so since i have a huge phobia of 'em... it costs over a thousand to be put to sleep around here....

i can garuntee either way tho it's not cheap... and if it's only one tooth... well it'll more than likely be over before he knows it...

you could also have him ask his dentist to give him an anti-anxiety medication before doing any work.... not all dentists have them, but alot do.