Electric toothbrush head and circuit board. The circuit board (left) controls the rotation of the head (right). Regular toothbrushing helps prevent tooth decay | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Terry, Sheila |
Bildgröße: | 3400 px × 4172 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |