For how long a tooth brush should be used? Why is it important to change regularly?
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All the toothbrush manufacturer recommends 3 months as a life of tooth brush. You can use a 1-2 of month extra if your tooth brush does not fray and remains soft. Too long use of same tooth brush makes bristles fray and also make them harder and less flexible so if you do not change for tooth brush for very long it will be less efficient in cleaning.
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Toothbrush should be changed in a period of 3 months as it's bristles start withering of and it will not serve the purpose of brushing regards.
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You should use a tooth brush for about 3 months or so. It is important to change a brush as bristles get spoilt and will not be effectively clean the teeth surfaces.
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Duration is not important. If you feel difficulty in brushing then change it.
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