Diary of a rail fan in Kansai,Japan(Ver.2)

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Why is it dangerous to use the same tooth brush for a long time?

5 Reasons Why You Should Change Your Tooth Brush Every 3 Months

When I saw a dentist today, she said "You should change your way of brushing tooth. Your current way won't remove plaque completely."
In addition to it, she recommended me to use dental floss to clean between teeth.
But, she said nothing about the frequency of changing tooth brush.
According to the article, it seems to be important to change Tooth Brush everu 3 months in order to keep bristles clean.
I realized that the brush kept with water and plaque will be the best place to reproduce germs. So, I make it a rule to change tooth brush more frequently.