Colour-coding System for Interdental Brushes 

The colour-coding system for interdental brushes is as follows ::

. White: 0.35 mm 

Pink: 0.4 mm (ISO 0)

Orange: 0.45 mm

Red: 0.5 mm (ISO 2)

Blue: 0.6 mm (ISO 3)

Yellow: 0.7 mm (ISO 4)

Green: 0.8 mm (ISO 5)

Purple: 1.1 mm (ISO 6)

Grey: 1.3 mm

Black: 1.5 mm

Watch avideo on how to use interdental brushes correctly :: HERE