1. The commonly used practice of putting a cap on your toothbrush is actually more detrimental as the moisture entrapped in the cap favours bacterial growth.
2. It has been advised not to store your toothbrush within 6 feet of a toilet as the airborne particles from a toilet flush can travel this distance!
3. The first toothbrush with bristles was manufactured in China in 1498. Bristles from hogs, horses and badgers were used.
4. The first commercial toothbrush was made in 1938
5. It is best to replace your toothbrush after you have had an episode of flu, cold or other viral infections as notorious microbes can implant themselves on the toothbrush bristles leading to re-infection.
Picture below shows: A used toothbrush bristle
Coloured scanning electron micrograph (SEM) of a bristle from a used toothbrush, covered in dental plaque