We have tried a number of toothbrushes with the primary problem being carbon miles due to the brushes coming from the other side of the world.
Well now a New Zealand company, Go Bamboo, is producing bamboo toothbrushes which can be thrown in your compost when you’ve finished with them.
Another option is to use the Miswak. I was given one of these amazing sticks by an Islamic friend who was using it during Ramadan, an annual month of fasting in which fluid or food is unable to pass the lips during daylight hours. Click here for more information on the miswak.