Some people find it tough, some find it easy.
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No, it is not.
Calculus will help but there is more to physics than just that.
its VERY VERY VERY hard math its VERY VERY VERY hard math
Brushing and flossing can remove plaque which causes calculus to form. But once calculus does form, it is too hard and firmly attached to be removed with a toothbrush. dental visits are necessary so that calculus build up can be professionally removed with sharp instruments. Source: i am a dentist
That should probably be easy. Try it out to be sure.