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.
Brushing your teeth too soon after meals can seriously damage them, warn dentists. Many people brush more than the recommended number of times per day - especially after a rich meal. But dentists warn that the extra brushing could be doing more harm than good. Brushing within half an hour of eating a meal or drinking a cup of coffee could ensure your teeth suffer worse damage. After drinking fizzy or acidic drinks, the acid burns into the enamel of your teeth - and the layer below the enamel, called 'dentin'.