1 The magnitude of a velocity vector is the rate of motion, usually measured in millimeters per year.  The direction of a velocity vector usually shows only the horizontal velocity. A vector is described in three dimensions: east-west, north-south, and up or down.
The cycle of eating and brushing can get tricky if you don't need to wait to eat after you brush, and then you brush after you eat -- over and over again during the day. If you eat sugary or acidic foods or drinks, the enamel on your teeth will be softened. Therefore, brushing right after you eat may not be wise. Dr. Rolfe explains that if you just had an acidic or sugary snack, you should gargle with a fluoride mouthwash and not brush your teeth.
Use the tip of the brush to reach behind each front tooth on the top and bottom. In addition, don't forget flossing - it's just as important as brushing. If you don't brush your teeth long enough, you may not be getting your teeth clean enough. If you leave behind bacteria on the teeth after brushing, it can lead to serious problems such as gingivitis or periodontitis.