Design:Edible pen

Many students have a habit of biting pen when is using it.Dutch designer Dave Hakkens  thought why I do not design an edible pen!He has researched many pens,and consider how to make a candy pen,doing three molds,the the final design is a ring-shaped section,in writing or thinking at any time can eat the next part of it,only the tip cannot be eat. However, in the case of long-term use is not health, is not it?