As a dentist's study suggested, only brushing your teeth is far from enough to clean your mouth. Because of the complexity of oral structure, a traditional toothbrush will just finish cleaning the job on the teeth surface. Cumulative plaque, odontolith, and food debris stuck between teeth will be hard to clear. String floss may help solve the problem, but every time it takes a lot of time and hurts gum and tooth enamel.