Whether teeth need to be extracted for orthodontic treatment will depend on the specific dental condition. Those with mildly misaligned or protruding teeth may choose not to have their teeth extracted, but those with severely overcrowded and protruding teeth will require further orthodontic treatment after tooth extraction.
The need for tooth extraction for orthodontic treatment is usually seen in cases of severe overcrowding and misalignment of the teeth, or open lips and exposed teeth caused by overgrowth of the upper and lower jaws. In fixed orthodontics, wisdom teeth and bicuspids (premolar teeth) from the upper and lower left and right sides can be extracted to obtain orthodontic clearance, and if there are residual roots and crowns in the dentition, the bad teeth are preferred to be extracted to preserve the healthy teeth.
That is, whether teeth need to be extracted for orthodontic treatment needs to be judged according to the specific dental situation.