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 wire of dental braces and the teeth.
Brushes are available in a range of widths ranked from 1 to 7, color-coded as per ISO 16409. Interdental brushes are classified according to ISO standard 16409:2006. The ISO brush size is determined by the PHD or Passage Hole Diameter in mm. This PHD is the minimum diameter of a hole that the interdental brush will pass through without deforming the brush wire stem.
TePe Interdental Brushes, color-coded according to ISO 16409