Teeth should be brushed for about 2 minutes two or three times per day, according to WebMD. A WebMD expert suggests spending about 30 seconds in each quadrant of the mouth.
While three two-minute sessions per day is considered the optimal amount of time for brushing, people shouldn't exceed this, according to WebMD. Excessive brushing can wear away protective enamel from the teeth or lead to gum damage. A toothbrush with a built-in timer may help those who have difficulty estimating the right amount of time. Some smartphone applications can sync with special electric toothbrushes to keep track of brushing time.