A study on the effectivity of the oral-b indicator toothbrush
Most dentists recommend to their patients that toothbrushes be replaced every three months before it loses its cleaning efficiency. Various researches have been done demonstrating that after this time period, the toothbrush's cleaning effectiveness begins to diminish. On the average, it takes 9...
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| Формат: | Диссертация |
| Язык: | English |
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