There are 2 main reasons why patients cannot get rid of dental calculus by themselves, the first is that the attachment of dental calculus is very strong, and the second is that the attachment site of dental calculus is very hidden. Tartar is a stone like substance that is slowly formed by the long-term layer-by-layer deposition of plaque in the oral cavity, which is firmly attached to the surface of our teeth, especially in the gum sulcus. Plaque can be removed by brushing. However, plaque deposits that form calculus are very difficult to remove by brushing. Professional tools, such as ultrasonic scalers or manual scalers, must be used to remove the plaque. It is unlikely that the patient will be able to remove the calculus himself with such specialized instruments, as there is a high risk of causing damage to the patient’s gums. On the other hand, calculus is located in the gingival sulcus, which is very hidden and it is impossible for the patient to see all the areas where it is attached, which is one of the reasons why it is difficult for the patient to remove the calculus himself.