DS1 is a willful little thing, bless him, and he is not mad keen on me brushing his teeth.
He has 5 teeth, with a 6th on it's way. I try to brush them every morning after breakfast. He clamps his lips shut and wont let me get the brush in, no matter how many silly 'brusher brusher brusher, brush your little teefs!' songs I make up and sing 
He seems more interested in doing it himself, especially if I am doing mine at the same time. So I have just been giving him a loaded toothbrush and letting him get on with it. Not much brushing gets done though, he's more just chewing on the bristles. Will this suffice at this age, and is getting some toothpaste in his mouth the real point? Or do I need to get in there and do some proper brushing??
Oh, and is once a day ok, or should I be doing it at night too?