Why don't you make bamboo toothbrushes?
Bamboo toothbrushes are an alternative to disposable toothbrushes, but they don't go as far as Lamazuna's replaceable-head toothbrushes.
They become darker over time, can leave a strange taste in the mouth, and you still have to throw them away when you've finished using them.
A bamboo toothbrush is not 100% compostable. Only the handle can be composted – on the condition that it hasn't been varnished. The nylon bristles and the metal staples often required to hold them in place cannot be composted.
A bamboo toothbrush is never made in France. It has to be transported from China!