An investigation into the effect of three months' clinical wear on toothbrush efficacy: results from two independent studies.

Objective: Limited evidence has suggested that a worn toothbrush may be significantly less effective than a new brush with respect to plaque removal. Two independent studies, one with a manual toothbrush and one with a powered toothbrush, were undertaken to compared the ability of these toothbrushes as new and after three months' use to remove plaque.

Methodology: Subjects from a general population were given either an Oral-B CrossAction manual toothbrush (Study 1) or a Braun Oral-B Battery (D4) toothbrush (Study 2).