“…Aside from the use of artificial means, this cleansing action is normally assisted by the functioning of the different parts of the mouth and by deglutition. Teuscher (1937) believed the toothbrush to be important in the control of caries, stressing the importance of a clean mouth, and the use of a toothbrush for its maintenance. Marshall (1939) stated that the rdle of dentifrices is insignificant in the treatment of caries.…”