TOOTHBRUSH

Abstract

The present invention provides a toothbrush that achieves properties suitable for cleaning targets without depending on the brushing method or technique. The hard portion has a head portion, a handle portion, and a neck portion. Assuming the position of the distal end portion of the neck portion is A, and the position of the posterior end portion of the neck portion is B, then the length in the thickness direction and the length in the width direction of the neck portion at position A are both 3.0 mm or more and 4.3 mm or less. The ratio of the length in the width direction of the neck portion at position A to the length in the width direction of the neck portion at position B is 0.30 or more and 0.60 or less. The ratio of the length in the thickness direction of the neck portion at position A to the length in the thickness direction of the neck portion at position B is 0.30 or more and 0.60 or less, and there is at least one curvature in the width.the direction of the main body of the brush measured by Method (α), and the bending in the direction of the thickness of the main body of the brush measured by Method (β), starting from the handle part which serves as the starting point.

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