Brush every day – keep the dentist away! This is Sandra Tsing Loh with the Loh Down on Science. Time to replace that old toothbrush! But there are so many types – WHICH one is best? Muhammad Kashif from the University of the Punjab, Pakistan, wanted to know. He and
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![Toothbrushes of different colors and shapes](https://lohdownonscience.com/wp-content/uploads/2021/03/2103-10_Brushing_Basics-900x480.jpg)