How old were your children when they became responsible for brushing their own teeth? DD is 8 and does it herself but I occasionally do it for her. DS is 6 and I always do his. I think I need to monitor DDs brushing more because whenever she uses the 'plaque revealing' tablets it always shows that she has not brushed thoroughly. I have shown her on so many occasions, sometimes by brushing mine at the same time to show her exactly how to do it but she just does not seem to bother when doing it independently. They both use electric toothbrushes btw.