When we open our mouths wide, the cheek muscles become tight
it is difficult to place the toothbrush at the gum margins of the outer surfaces
Simply close your mouth a little bit the cheek muscles will be relaxed
Then, the toothbrush can reach the gum margins
While brushing the teeth together
if your lip is tensed
it is also difficult to place the toothbrush at the gum margins
Then, bite the teeth together
the toothbrush will be able to reach the gum margins easily
Remember that, the bristles should tilt upward when brushing the upper teeth
and tilt downward when brushing the lower teeth
