jueves, 5 de octubre de 2017

TOOTHBRUSH

             toothbrush

Resultado de imagen de cepillo de dientes napoleon




INVENTOR: Chinese people


YEAR: 1498

PLACE: China

                  
IMPROVEMENTS
 - To reach the most distant teeth.
 - It prevents diseases.
 - Dental hygiene.
NEGATIVE EFFECTS
  Nothing.

https://www.loc.gov/rr/scitech/mysteries/tooth.html

4 comentarios:

  1. The most expensive toothbrush in the world xd

    ResponderEliminar
  2. This picture is not free to use, but it is a nice example.
    Where is the reference? Remember to cite the source of information.
    The best improvement is to reach the most distant teeth

    ResponderEliminar