One-year-old baby teeth grow crooked, it is recommended to go to the hospital in time to check the cause of the disease, and remove the external bad stimulus for early preventive or blocking orthodontic treatment in time. 1. Early preventive orthodontic treatment: teeth due to caries, trauma or premature extraction will cause the neighboring teeth to move to the side of the gap, and clinically use the gap retainer to keep the length of the teeth. Abnormal attachment of labial and lingual bands will cause the crown of mesial incisors to move to the distal center or the anterior teeth to open up, which needs to close the mesial incisors gap and then undergo surgical operation to remove the excessive labial bands as well as lingual bands orthodontics. 2. Early interruption of orthodontic treatment: bad sucking and biting habits, abnormal swallowing or tongue spitting habits can cause malocclusion, which requires the use of finger braces, lip stops, buccal screens, palatal nets and other orthodontic appliances to break the bad oral habits. For early orthodontic treatment of misaligned teeth use split-spring braces, rubber bands, etc. to align the teeth. More than one year old baby teeth grow crooked, it is recommended to timely hospital examination and treatment, so as not to aggravate the degree of malocclusion.