We consulted closely with dental professionals to create a toothbrush that gets your teeth cleaner but minimizes your impact on the environment. The design includes a curved handle for those hard-to-reach places and a three-level bristle arrangement to massage your gums. And while the bristles are brand new, the handle is made from recycled yogurt cups.Enjoy the same best selling Preserve Toothbrush whether you choose the Travel Case or Mail Back Pack. The Mail Back Pack is a revolutionary approach to packaging. The lightweight package doubles as a return envelope. Just pop your used Preserve toothbrush inside and send it back to us for recycling (our dentist friends recommend replacing your brush every three months ).