tooth care - Regular brushing is recommended by healthcare professionals twice a day. [3]. Studies show that the minimum required time interval is once every two days. A mirror may be used to see if the plaque is completely removed during brushing. Electric toothbrushes are no more effective than the manual variety, according to research. However, 'rotation-oscillation' electric toothbrushes out-performed manual brushing, removing around 7% more plaque and leading to 17% less gum disease than manual brushes. [