Toothbrush bristle wear with the rolling method of brushing

Abstract

We did an in vivo study with weekly observations of the relationship between toothbrush bristle wear and brushing force with the rolling method, as well as an in vitro study of the relationship between bristle wear and the removal of experimental plaque. The in vivo study indicated that the subjects tended to increase brushing force as the bristles became worn. The in vitro study indicated that the hardness of the bristles decreased with use. The actual area cleansed decreased over the life of the toothbrush for all values of brushing force. These results indicate that tooth-brushes should be replaced every 4 weeks for maximum plaque removal effect.