Periodontitis can be brushed with an electric toothbrush, whether it is an electric toothbrush or a manual toothbrush, the patient needs to carefully clean out the plaque to avoid the re-accumulation of calculus, which can lead to the aggravation of periodontitis. The electric toothbrush also requires human assistance to brush the teeth properly, and the angle and time placed on each tooth surface needs to be controlled by the patient himself, and the patient needs to follow the instructions carefully. Although periodontitis needs to rely on periodontal basic treatment, but the follow-up patient’s oral health maintenance is more critical, so after the electric toothbrush brushing, also need to use the gap brush, dental floss or flosser equipment, clean out the plaque in the gap. The electric toothbrush cannot clean the space between the teeth, and there will be a lot of plaque in the space between the teeth, which will lead to the loss of dental bone.