Patent ID: 7419225

Claim:
A movable brush head for an electric toothbrush, comprising: a bristle carrier; bristles anchored in the bristle carrier, at least part of the bristles being pointed filaments having a tip, the bristles being set in motion upon movement of the brush head; the pointed filaments being arranged in tufts or clusters, each tuft or cluster containing a plurality of filaments; the pointed filaments having a maximum nominal diameter Δ nom of 0.15 to 0.25 mm and a length, measured from the exit point on the bristle carrier, of 7 to 13 mm, the diameter of the pointed filaments being greater than 75% of the nominal diameter up to a distance of 5 to 6 mm from the tip and being smaller as said distance becomes less; and the arrangement of the pointed filaments on the bristle carrier being such that the tips of the pointed filaments cover a path (d max ) of 5 mm at the most upon the movement of the brush head.