I'm guessing most kids don't like to have their teeth brushed. Kiddo has gotten a lot better at it over the last few months. I've tried various tactics in the past but the one that works the best is storytelling. I tell him that the story is starting and he'd better get in the bathroom so as not to miss it. He doesn't even care if my creative juices are a little weak that evening and the story is a bit pathetic. Lately, since we have been reading chapter books, I will do a recap of the previous night's chapter. He LOVES that.
Whatever works, right?