The ornamental design for a toothbrush, as shown and described.
1. Toothbrush
1.1 is a perspective view;
1.2 is a top view;
1.3 is a bottom view;
1.4 is a top-side perspective view;
1.5 is a bottom-side perspective view; and
1.6 is another perspective view.
The claimed industrial design is a device for cleaning teeth and massaging gums; it is a toothbrush; the claimed design includes the following compositional elements: body, neck and head; the body is in the form of a voluminous elongate ellipsoid with a smooth narrowing to the neck of the toothbrush, wherein said body has a rounded low part and said low part is slightly bent down; the upper surface of the body has an oblong recess, oriented from the low part of the body to the upper part of the body; the body and the neck are smoothly connected with each other, while in the place where the body and neck connect, a slight expansion of the body is made on both sides; a convex element is present on the connection of body with the neck; the neck and the head are smoothly connected to each other; the head has a flat ellipsoid shape; elements shown in dashed lines are not subject to legal protection and are presented for a better understanding of the claimed industrial design.