Dental scaling can usually remove calculus. However, if the calculus exists under the gums, subgingival scaling is also required to remove it. The details are as follows: 1. The current more scientific method of removing dental calculus is scaling. Scaling will wash away the calculus and reveal the original teeth. This is good for oral health. If the location of dental calculus is deeper, located under the gums, it is also necessary to perform subgingival scaling. If the calculus is not cleaned in time, it may lead to bad breath, periodontitis, loose teeth and even tooth loss. 2. Before scaling, you need to pay attention to the fact that if you are a woman, you need to avoid the menstrual period; at the same time, after scaling, do not eat too cold, hot, acidic food, so as not to stimulate the teeth, which is not conducive to the health of the teeth; in addition, patients wearing pacemakers can not use ultrasonic scaling. If there is pain in the teeth, periodontal swelling, do not be too nervous, timely to the regular hospital stomatology, so as not to delay the condition.