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Abstract

There is disclosed a toothbrush with curved bristles formed of natural or manmade fibers of thermoplastic or thermosetting material such as acetate fibers, rayon fibers, acrylic fibers, nylon fibers, polyamide resins, polyimide resins, phenolic resins, or urea resins; the bristles are set in two rows, at least one of the rows being offset from the center-line of the brush and with a curvature which is concave viewed from the center-line of the brush; some embodiments have bristles with substantially uniform curvature and other embodiments have bristles wherein the curvature in non-uniform and the greatest curvature is approximately one-third of the length from the distal extremity of the bristle. Preferably the bristle distal extremities are at about a right angle to the proximal bristle portion and the brush optionally has a row of short straight bristles parallel to the row of curved bristles on the concave curvature side of the curved bristles. In one embodiment the cross section of the bristles is triangular or other polygonal shape and approximately half of the bristles at the outer end portions of the bristle row are longer than others of the bristles and extend a greater distance from the bristle mounting face. A bush handle has a generally circular cross section and is slightly flattened on one side to facilitate controlled rotation of the brush about its longitudinal axis; the handle has circumferential grooves for better gripping action.

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First Claim