Electric toothbrush head and circuit board. The circuit board (left) controls the rotation of the head (right). Regular toothbrushing helps prevent tooth decay | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Terry, Sheila |
Taille de l’image : | 3400 px × 4172 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |