Have you tried getting them to say “eeee” as in “cheese”?
Even if the mouth stays closed the cheeks will relax and you will be able to clean the outside faces of the teeth and gums perfectly well.
And then if you make rapid circular massaging motions with the head of the toothbrush, your child will soon relax (or be tickled) and will open their mouth (more cooperatively)
At DentistKids we use a mirror to show children their own mouths and to explain them how to brush their teeth effectively.
#circularmotions #brushing #toothbrush