Abstract: A tooth brush is disclosed in which parallell bristles extend in opposite directions from a central plate-like stem connected to a shaft or a handle. The tooth brush is used for cleaning teeth interspaces and comprises a base plate which abuts the gum and protects the same when the bristles work upon opposite teeth faces. The bristles are longer next to the base plate and gradually shorter as the distance therefrom increases. Also in the length direction of the stem the length of the bristles varies, and the minimum bristle lengths are found either at the tip or at the middle of the length of the active part of the brush.

Abstract: A double-ended toothbrush having two bristle portions, a major or larger, contoured bristle portion at one end and a minor or smaller wedge-shaped bristle portion at the other, both formed of parallel rows of bristles extending out perpendicularly from a base which is longer and narrower than most available toothbrushes. The larger brush head has four parallel rows of tufts (except at its end) which are shaped or contoured to conform to the natural contour of the teeth and gingivae, with the two outer rows forming a shallow concavity, the shape allowing the use of the natural back-and-forth brushing action. The smaller, interdental brush head is made of six tufts arranged in two parallel rows which are cut in a uni-bevel facing outwards to form a small wedge-shaped interdental brush.