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Hi and thanks for the query.
There are two types of calculus, one is mineral and one is non mineral, the non mineral calculus is easy to remove and can be scaled off at home. But the mineral calculus embeds in the enamel of the teeth and can not be removed by a scaler at home. It will have to be removed with a powered or ultrasonic scaler at your dentists. That is why the calculus on the #18 is not coming off.
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Wish you good health.