Dental crowns are used to restore and strengthen damaged or weakened teeth. They are tooth-shaped caps that are placed over a tooth to restore its size, shape, strength, and appearance. Crowns can be made from various materials such as porcelain, metal, or a combination of both. They are commonly used in cases where a tooth has been severely decayed, cracked, or broken. Crowns can also be used to cover a dental implant or to anchor a dental bridge in place. Overall, dental crowns are a versatile and effective solution for restoring the functionality and aesthetics of damaged teeth.