My 12 year old daughter has never wanted to brush her teeth. This has been a constant battle throughout her life. She now has braces and it is an even bigger battle. She hates toothpaste and barely puts the toothbrush to her mouth when I allow her to brush them herself. From time to time, I insist on brushing her teeth. What a scene! She throws a fit and sobs as if I was killing her. I've never seen anything like it. Help!