TOOTHBRUSH Russian patent published in 1997 - IPC

FIELD: sanitary and hygienic articles. SUBSTANCE: toothbrush has handle, neck portion and head with bristles. Rows of bristles are set on head in inclined position relative to toothbrush longitudinal axis. Number of bristle groups in each second row exceeds number of bristle groups in the previous row by at least two. Edges of head portion of toothbrush are free of bristles. EFFECT: increased efficiency, simplified construction and improved quality of cleaning teeth. 1 dwg