Calculus is a very hard substance around the teeth, and the best way to remove it is currently to go to a hospital and have your teeth scaled by a doctor. However, if you want to remove calculus on your own and do not want to go to the hospital for treatment, you can consider purchasing your own dental cleaning equipment, such as a hand scraper. The hand scraper can remove the calculus from the surface of the teeth, but you must be careful not to damage the gum tissue during the process. You can check how to use the hand scraper online, and after the calculus is removed, you should brush the tooth surface carefully to make it as smooth as possible, so that the calculus will not easily reattach.