My daughter has always been reluctant to let us brush her teeth, she'll take the brush and chew it but hates us brushing. Now she's getting older (15 months) it's a flat out refusal with mouth clamped shut, kicking and pushing the brush away. It's almost impossible to force her thanks to the combination of all of that and I don't want it to spiral into hating teeth brushing as a result. Any tips/suggestions on how to make it better? I'm paranoid she'll have rotten teeth at this rate!