J.V.
When my son was a toddler I would let him have his tooth brush and he did what he wanted to with it. I would even brush my teeth with him and after a while he wanted M. to brush his teeth. I remember trying to brush his teeth he would "bite" my fingers and giggle. It takes time before they get the hang of letting you brush their teeth. Eventually I made it into a game where I would see how long he would open his mouth for and he liked that. Soon he would open for M. until I was done brushing his teeth. I never did brush my son's teeth before nap time, just did it in the morning time and before bed time. You may want to brush his teeth when he's taking a bath. I didn't start my son on regular toothpaste until he was able to spit in the sink and that was until he was about 4 years old. I think I replaced my son's tooth brush every month or two months because he would bite on them. Hopefully this helps you.