Porcelain braces have the following hazards: 1, if the porcelain tooth restoration, the tooth surface needs to be the hardest enamel to wear porcelain braces, so the damage to the teeth is huge. 2, porcelain braces if the fit is not good, there will be bacteria through the gaps into the porcelain braces, resulting in tooth corrosion, and this corrosion is very serious, and will eventually lead to porcelain braces fall off, and even teeth will fall off. 3, porcelain braces if the design is not good, will cause the teeth to loosen. 3, porcelain braces if the design is not good, will cause the teeth to loosen. Therefore, as a last resort, never crown restoration. However, if the affected tooth has undergone root canal treatment, it will become very brittle, and in order to protect the affected tooth, crown restoration is usually used to prevent it from fracturing.