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All daily supplies have their own service life, so do tooth brushes.
However, we barely know the valid period very well.
Acording to the oral health programmes, dentist suggest people to change tooth brush about every three months, in order to make sure the tooth brush is in the best condition.
By means of combining dentifrice with tooth brush, the dentifrice will outflow while brushing teeth.
Thus, As soon as the tooth brush is running out of dentifrice, it's the time we have to change the tooth brush.
Meng Rong/Shen Chung Shian/Wu