Explain why the velocity and acceleration vectors behave as they do for the preset motions (linear acceleration I, II, circular motion, & harmonic motion).
Dentist Tip: Brushing three times a day is ideal. If you can brush once after every mealâbreakfast, lunch, and dinnerâyou minimize the growth of bacteria in your mouth. But wait an hour after each meal: brushing too soon can cause damage to the enamel of your teeth.
When you brush your teeth: 1  Brush your teeth 2 times a day, in the morning and at night. 2  Use a toothbrush with soft, rounded-end bristles and a head that is small enough to reach all parts of your teeth and mouth. Do not scrub. 2  Vigorous brushing can make the gums pull away from the teeth and can scratch your tooth enamel. 3  Brush all surfaces of the teeth, tongue-side and cheek-side. 4  Pay special attention to the front teeth and all surfaces of the back teeth.