My dd is 18 mths and she (wont let me near) brushes her teeth twice a day but not properly. is how her how i do it and sometimes she gets the action right or i play a game and rollher in in the towel so her hands are by her side and i quickly brush them. i only dab the toothpaste on the brush. i want to use more toothpaste but dont want her to swallow it - at what age should she be rinsing and any tips on how to teach her to do this?