COMPATIBILITY Those replacement heads only fit on the kids version of the Sustainable Tomorrow Electric Toothbrush. Click here for Philips Sonicare compatible bamboo heads. BACKGROUND Plastic toothbrushes are a key part of our plastic waste story. According to research by Foreo, 1 billion toothbrushes are thrown away annually in the United States alone. This is 50 million pounds of waste that sometimes ends in waterways and oceans. According to National Geographic, every toothbrush used since the 1930s still exists on the planet. Now is the time to make a change, don't you think? The Sustainable tomorrow Bamboo Electric Toothbrush use replaceable heads carved from bamboo. Each head takes around six months to compost while a plastic one takes hundreds of years to fully break down. The average person uses 300 toothbrush heads in their lifetime. Make sure yours are eco-friendly! BENEFITS Eco-friendly toothbrush heads (3 units) Zero-waste packaging & delivery ENVIRONMENTAL FOOTPRINT To properly dispose each Bamboo Electric Toothbrush head, place it in a composting bin. It will take around 6 months to compost. Our plant-based bristles are made of castor seeds oil. Moreover, we are glad to share that they will eventually break down in a home composting environment. However, we cannot legally call our bristles "compostable" as it will takes more than 3 months. That is still a huge improvement compare to petroleum based bristles as our bristles will become plant food at some point!