The adult horizontal chattering and brushing method is an effective way to remove plaque in the gingival sulcus and on the dental surface. The horizontal tremor mainly removes plaque from the cervical part of the teeth and the gingival sulcus, and the brush mainly removes plaque from the labial (cheek) and lingual (palatal) surfaces. The specific operation is as follows: 1. Place the brush head on the cervical part of the teeth, with the bristles pointing in the direction of the roots (maxillary teeth upward, mandibular teeth downward), with the bristles at an approximate angle of 45° to the long axis of the teeth, and apply slight pressure so that the bristles partially enter the gingival sulcus and partially rest on the gums. 2. Start brushing from the buccal side of the posterior teeth in a group of 2 to 3 teeth, using a short horizontal chattering motion in the same part several times back and forth, then turn the toothbrush toward the crown and brush the buccal side. After brushing the first part, move the toothbrush to the next group of 2 to 3 teeth and reposition it, paying attention to the area with overlap with the previous part, continue brushing the next part, and finish brushing the lip (cheek) side of the upper and lower teeth in order. 3, Brush the lingual (palatal) surfaces of the posterior teeth in the same way. 4. When brushing the lingual surface of the upper front teeth, place the brush head vertically on the tooth surface so that the anterior bristles touch the gingival margin and tremble from top to bottom. When brushing the lingual surface of the lower anterior teeth, tremble from the bottom up. 5.When brushing the occlusal surface, point the bristles to the occlusal surface and brush back and forth with slight force.