Dental crowns are also known as braces, wearing braces can play a restorative, protective role on the teeth, long-term wear orthodontic can also have aesthetic effect. 1. Repair, protection: for people who have undergone root canal treatment, or the tooth itself has a certain degree of defects, wearing a crown can protect the tooth to avoid cracking due to the fragility of the situation. Because the crown covers the outer side of the tooth, it is the outer crown that bears the force when eating and chewing, which can reduce the wear and tear of the tooth and help repair and protect the tooth. 2. Aesthetics: Dental crowns can be worn for a longer period of time to correct irregularities and malposition of teeth, adjust and restore the normal occlusal relationship, which will help the overall oral aesthetics.