7B is a schematic view of the preferred embodiment toothbrush shown in FIG. 7A, illustrating the mechanism in a different position for imparting motion to the bristle carrier; [0058]FIG. 7C is a schematic cross-sectional view taken along line 7C-7C in FIG. 7A; [0059]FIG. 7D is a schematic cross-sectional view taken along line 7D-7D in FIG. 7B; [0060]FIG. 8A is a schematic view of a preferred embo