The correct brushing time and method include brushing time, selection of toothbrush, brushing sequence, brushing method, and regular replacement of toothbrush.

1. Brushing time: The best time to brush teeth is 3-5 minutes after each meal. Brush your teeth after every meal to clean the food residue on the tooth surface and between the teeth, in order to prevent bacteria from staying on the tooth surface and producing acid, which can lead to tooth decay. Brush your teeth for at least 3 minutes each time, using the Babbitt brushing method.

2. Toothbrush selection: It is recommended to use a soft bristled small head toothbrush to clean all tooth surfaces. If necessary, it is also recommended to use dental floss interdental brushes or dental irrigators as auxiliary cleaning methods to clean the adjacent surfaces of teeth.

3. Brushing sequence: Brush from top to bottom, first brush the upper jaw and then the lower jaw. Place the bristles at the junction of the teeth and gums, and brush towards the gums at a 45 degree angle.

4. Brushing method: Use gentle force to gently massage the gums first, and then brush the surface of the teeth back and forth in a small vertical direction. Finally, brush the surface of the teeth back and forth horizontally to ensure that each tooth is thoroughly cleaned.

5. Regular replacement of toothbrush: It is recommended to replace the toothbrush every three months or when the bristles are deformed or worn.

Proper brushing habits can help maintain oral health, prevent oral problems such as tooth decay and periodontal disease. Especially teenagers should pay attention to their dental health and develop good brushing habits under the supervision of their parents.