Interdental brush

An interdental or interproximal ("proxy") brush is a small brush, typically disposable, either supplied with a reusable angled plastic handle or an integral handle, used for cleaning between teeth and between the wires of dental braces and the teeth. The use of interdental brushes in conjunction with tooth brushing has been shown to reduce both the amount of plaque and the incidence of gingivitis when compared to tooth brushing alone. Although there is some evidence that after tooth brushing with a conventional tooth brush, interdental brushes remove more plaque than dental floss, a systematic review reported insufficient evidence to determine such an association.

Interdental brush

The size of interdental brushes is standardized in ISO 16409. The brush size, which is a number between 0 (small space between teeth) and 8 (large space), indicates the passage hole diameter. This corresponds to the space between two teeth that is just sufficient for the brush to go through without bending the wire. The color of the brushes differs between producers. The same is the case with respect to the wire diameter.

Brush size according to ISO 16409
Brush size 0 1 2 3 4 5 6 7 8
Passage hole diameter in mm ≤ 0.6 0.7–0.8 0.9–1.0 1.1–1.2 1.3–1.5 1.6–1.8 1.9–2.3 2.4–2.8 ≥ 2.8


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