humble brush adult, - yellow, soft bristles The original that took the world by storm. Cleans just as well as a plastic toothbrush but made from mother earth’s best invention, bamboo. Equipped with the highest quality nylon bristles to ensure dentist approved results, this iconic toothbrush has to date sold in excess of 35 million pieces. Humble Brush has a handle made from 100% biodegradable, sustainably-grown bamboo. The bristles are made of nylon-6 bristles from Dupont, the packaging is eco-friendly, the box and inside wrapper are made from recycled materials and can be thrown out with the organic trash.