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.

Abstract: A toothbrush is disclosed which is capable of cleaning the buccal-labial and lingual surfaces of teeth simultaneously. The method of fabricating the toothbrush is also disclosed. The toothbrush includes a bristle mounting head, a holder for supporting the bristle mounting head and a plurality of cleaning bristles on the bristle mounting head, with the cleaning bristles being in the form of two arcuate or angular shaped bundles of nylon filaments, whose ends are spaced apart and opposed to each other. When the toothbrush is placed over teeth to be cleaned the tips of the bristles at the ends of the bundle rub against opposite surfaces of the teeth.

Abstract: This is an electro-mechanical tooth brush having opposed sets of bristles specifically designed to simultaneously brush both the inner and outer surfaces of the teeth by reciprocating one set back and forth, and also having a central hub element for brushing the chewing surfaces of the teeth fixed to and moving with the reciprocating set of bristles.