I take him to the vet for trimmings. I don't have any avian vets in my area though, and i haven't had a chance to take him to one yet. It has always been just that one part. And despite his constant chewing, that "tooth" always grows.

he was badly abused and neglected by his previous owner. When I got him, he was starved, cold, half dead, and in general a mess.

Also, i've never been able to get him to use a cuttle bone.