CMY Toothpaste

You need three tubes of toothpaste, one yellow, one cyan and one magenta. Not stripey or pastel coloured, but straight-up process colours.

• Put some on your toothbrush. Maybe some from one tube, and some from another. Maybe some from all three.
• Brush teeth.
• Spit any colour of the rainbow (but only one at a time).
• Would this be good for getting little ones to brush their teeth? I want some!

Toothbrush image from Daniel Fogelqvist