2,697,239 wherein the brush head is arranged transversely to the stem of the toothbrush so that the handle extends outwardly from the mouth perpendicularly to the gum lines of those teeth being brushed.Ħ. A curved head toothbrush is described in U.S. By providing an upwardly-curved portion of the stem, the insides of the teeth can be brushed with the handle held flat and the upwardly-turned portion remaining clear of the front teeth. 1,513,104 provides a wrap-around arrangement for bristles resulting in the majority of the bristles extending from opposite sides of an oval head. Other toothbrushes have curved heads or toothbrush heads with oppositely-disposed bristles. Toothbrush bristles vary in stiffness or combine different stiffness, e.g., one toothbrush includes a group of center bristles with bristles which are softer and longer in order to provide an improved massage of the gums and improve the cleaning of the teeth. Another design provides for angled bristles. One such brush design includes bristles which extend from a head in generally opposite directions. Various arrangements have been proposed to modify toothbrushes to facilitate cleaning of the teeth and gums.
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