It may take a year to two years for a 12 year old to have their teeth straightened, depending on the child’s actual condition. A 12 year old child has basically completed tooth replacement, and the appearance of irregular teeth is the need for orthodontic treatment. At this age, children are in the prime time for orthodontic treatment. Compared to adult patients, 12-year-olds spend less time on orthodontic treatment and have better results. It usually takes between one and two years, and the exact amount of time needed is determined by the individual’s dental development. Orthodontic period must pay attention to regular review, orthodontic recovery period to pay more attention to oral hygiene, morning and evening to develop a good habit of brushing, brushing can choose soft bristle toothbrush. Don’t eat hard food in your daily diet, and use warm water to rinse your mouth in time after meals. Before your child’s teeth are straightened, it is recommended that parents take their children to the hospital for a comprehensive examination and correctly straighten their teeth under the guidance of the doctor.