This is a novelty that I saw on tv. The handle of the toothbrush is made of bamboo and there is a small hole with a seed. When the toothbrush gets old you do not throw it but you can plant it. The seed inside the bamboo handle will germinate and show its appearance. It can be a citrus plant or even an ornamental that would give you flowers. I like that novelty although I am not sure if the seed will grow after 3 months of using the toothbrush.