Bamboo is one of the coolest materials, it looks pretty, is tough as nails and can be farmed sustainably as it grows almost anywhere and grows super-fast. The coloured bristles are for those who find earthy looking stuff just too earthy looking, it can also be cut down tjop-tjop to suit your kiddies cute lil' fist. Ever heard you should get a new toothbrush every 6 months? Bah I say! Our world has way to much waste, plastic and otherwise. Make the switch to a cool bamboo toothbrush and use it until the bristles looks like the hair on the back of Trompie's Boesman, his faithful brak. When it is time to replace your toothbrush, rest easy in knowing the bulk your toothbrush is biodegradable, you may even want to convert it into toothpicks if you got some skill and looooots of time on your hands. The bristles are made of Nylon, our search continues to find a brush that is 100% biodegradable, but you can eliminate 97% of disposed plastics by using this one!