A brush tip (120) for a motorized toothbrush has a first brush head (122) and a second brush head (124). The second brush head (124) encircles the first brush head (122). A shaft (125) has two cranks (131, 133), each engaging one of the brush heads (122, 124). Continuous same-direction rotation of the shaft (125) causes the brush heads (122, 124) to counter-rotate about a common axis. Distal ends of the first set of bristles on the first brush head (154) form a circular pattern and the distal ends of the second set of bristles on the second brush head (155) form an elliptical pattern (A).
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