Oral B 060640 Crossaction 35 (6 Manual Toothbrushes), Soft #51 (mixed colors) Crisscross bristles. Clinically proven (one-time brushing studies) to remove to more plaque than the leading brushes. The brand more dentists use themselves.Oral B 060640 Crossaction 35 (6 Manual Toothbrushes), Soft #51 (mixed colors) Crisscross bristles. Clinically proven (one-time brushing studies) to remove to more plaque than the leading brushes. The brand more dentists use themselves.