Let him see you doing it, and let him play with the toothbrush a little, kind-of doing it himself. That's probably what did it for my son. I used to have to pin him between my legs and open his mouth for him and get it done as quickly as possible. He's just turned 2, and now he'll come stand in front of me and open his mouth on his own and then I'll let him have the toothbrush and he'll move it around in his mouth (not effective, but that's why I get in there too), and sometimes he even throws a fit because he can't reach his toothbrush and he wants to brush his teeth. It's all in the persistence; just keep at it and you'll get there.
at 12:09 PM on Jun. 15, 2009