| 摘要 |
A toothbrush comprising five or seven rows of tufts of soft filaments or bristles of which the middle row of bristles is higher than the rows of tufts of bristles on each side. The middle row performs the special task of cleaning the gum line or sulcus while the rows on each side alternately, as used in various positions in the mouth, either clean the teeth themselves or support and massage the gum tissue.
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