Crooked front teeth may also be caused by abnormal occlusion. The problem can be solved through orthodontics. The first condition for orthodontics is periodontal health. Specifically, you need to go to the hospital to take a dental X-ray examination to determine the correction plan. It usually takes one and a half to two years and costs from a few thousand to tens of thousands of yuan, depending on the chosen correction plan, braces materials and doctor's skills.