When your toothbrush looks frayed and you want to keep on using it, just run it under hot water for a minute or two and straighten out the bristles by stretching them. You will find the heated bristles respond well to it.
The reason the bristles become pliable after heating them is because they are made of thermoplastic. When this plastic is heated it is easily manipulated. Once it cools again, it will be as rigid as it was before being heated.
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