Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
17 century toothbrush was arisen. 19 century, toothbrush already very popular. Nowadays, people realized the health of teeth increasingly important. The reason why toothbrush is so important is that everyone wants healthy teeth. Traditional way to keep toothbrush is not good at move of wrist in longitudinal, which limit flexibility of wrist. Therefore, most people brush teeth was used to right to left. But it is harmful for teeth seriously. The toothbrush release index finger, so wrist will more flexible and brush teeth in longitudinal will be easy. May you have good tooth.
KunMing University of Science and