My DD is 21 months and has got all her teeth bar 3 molars. I brush them twice a day - or I try to. She doesn't like it and will only tolerate it if I sing a song, and even then I'd say it only lasts a few minutes. I'm worried that I don't quite get all the bits where teeth meet gum, and have seen some more yellow bits round there. How do people do it? My toddler simply won't grin teeth/pull back lips like you need to to get a really good brush.