A Dutch design school student, Dave Hakkens, invented an edible pencil – a pencil that can be eaten. It is estimated that due to the habit of biting the pen, the ordinary pen is tasteless or unpalatable. He decided to change the status quo after suffering. Therefore, he improved the material that can be eaten as the raw material of the pen by design. 
After the trial and error, the pencil that can be eaten finally made this kind of pencil that can be eaten, and also made a bracelet that can be eaten. This completely solves the problem that some of your behavior will benefit from your bad habits, so for the time being it is a good thing. 
Can eat pencils (2) 
Can eat pencils (three)
Source of information: Internet
Kaiping Yufa Sanitary Ware Co.,ltd , https://www.dlsenfaucets.com