Orthodontics can not only meet the needs of beautifying the image, but also the needs of physical health. Because the uneven arrangement of teeth directly affects brushing, some gaps cannot be brushed, allowing food residues to breed bacteria in the dead corners, which can easily form tooth decay; oral hygiene is also affected, which in the long run will cause periodontitis and lead to loose teeth; some people suffer from tooth decay Improper alignment can also cause abnormal tooth wear, cause bad breath and other oral diseases, and seriously affect speech and pronunciation. Orthodontic indication 1: Deep overjet of the front teeth. Deep overjet of the front teeth is also called "teeth lifting". The upper front teeth protrude too far forward (protruding) beyond the lower teeth. This is a common clinical malocclusion. Deformity, often accompanied by deep coverage of the front teeth, requires dental correction. Indications for Orthodontics 2: Anterior crossbite looks like a “bulldog” in appearance, that is, the lower front teeth protrude forward or the upper front teeth are positioned too far back. This situation also requires dental correction. Orthodontic indication three: Malocclusion Malocclusion refers to abnormalities in the arrangement and position of the teeth and the occlusal relationship. The manifestations of malocclusion are diverse. Common malocclusions include the misalignment of individual teeth, which is the incorrect position of one or more teeth in the dentition, such as teeth tilting, crooking, twisting, etc., which requires dental correction. . Orthodontic indication four: Open bite means that the front teeth or back teeth cannot bite in the vertical direction, the incisal ends (maxillary surfaces) have no contact in the vertical direction, and the normal overbite distance cannot be achieved. Normal overbite: the upper front teeth cover 1/3-1/2 of the lower front teeth. The open jaw greatly affects the chewing function, speech function and appearance. As the degree and scope of the open jaw increases, the function decreases more seriously, and the masticatory muscle tone is insufficient (inability to chew). Orthodontic indication five: Midline deviation. The center line of the upper front teeth is not aligned with the center line of the lower front teeth, which can be corrected through orthodontics.