Toothbrushes are distinguished by their bristles, and there are two types of toothbrushes, soft bristles and hard bristles. The bristles of soft bristles are very soft, thin and dense, while the bristles toothbrushes are just the opposite, with harder bristles. It's relatively thin, but also very sp......
Read MoreEveryone knows that toothbrushes cannot be used for a long time. Basically, they need to be changed every once in a while. Many people will change them every three months according to the written on the toothbrush. Does the toothbrush really need to be changed every three months?
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