Black triangle refers to the black triangle space formed between teeth, which is usually caused by gingival recession or tooth movement. Solutions to the Black Triangle include:

1. Orthodontics: If the black triangle is caused by tooth movement, orthodontic treatment can be considered to eliminate the black triangle by adjusting the position of teeth.

2. Gum plastic surgery: If the black triangle is caused by gum recession, gum plastic surgery can be considered. This operation can fill the black triangle by transplanting gingival tissue or using artificial materials, so that the gaps between teeth disappear.

3. Dental restoration: If the black triangle is caused by a tooth defect, dental restoration can be considered. Restoration methods include tooth veneer, tooth filling or crown. Fill the black triangle by repairing the shape and size of teeth.

4. Tooth cleaning and oral hygiene: Keeping good oral hygiene habits, brushing your teeth regularly, using dental floss and mouthwash can reduce the occurrence of the black triangle.

In solving the black triangle, it is necessary to determine the most suitable method according to personal situation and dental problems. It is recommended to consult a dentist for professional evaluation and suggestions.