The standard answer is that it is used to massage the gums and promote blood circulation. It can also increase corneous matter on the surface, and increase the ability to fight off disease. This type of toothbrush is recommended most by doctors.
標準答案是它可以清潔牙縫（牙周病人牙床萎縮，牙縫較大，可用軟錐清除食物殘渣），同時可按摩牙齦，幫助血液循環，醫生建議儘量採用此種牙刷。