| 摘要 |
<p>This electrical toothbrush has the particular feature of working by means of a reversible rotating spherical-cylindrical cleaning surface, with the reversibility causing the cleaning surface to run from the gum to the top of the tooth so as to avoid food residues sticking between the gum and the neck of the tooth. The cleaning surface is preferably made from bristles of a spherical-cylindrical shape and removable in order to be substituted by similar brushes fitted with bristles and of a shape suitable for the cleaning function. <IMAGE></p> |
