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The main purpose of using toothpaste in the washing machine is to remove unpleasant odours from laundry, thanks to the whitening properties of the ingredients contained in the toothpaste. Toothpaste acts as a natural disinfectant by removing bacteria from laundry.
As an alternative to toothpaste, a little baking soda mixed with a cup of hot water poured directly into the washing machine door before starting the washing cycle can also be used.