A crown or "cap" is a restoration treatment that covers the whole visible surface of a tooth, making it look healthy. Crowns serve many functions, including creating and improving a pleasing aesthetic appearance.
With sealants, a tooth-colored plastic composite "coating" is painted onto the surface of the tooth. This helps seal the deep grooves where decay is most likely to start.
The purpose of a bridge is to replace one or more missing teeth, allowing them to look and function naturally. It is permanently anchored to the teeth on either side of the space created by the missing teeth.
Dental implants are designed to provide a foundation for replacement teeth that look and function like natural teeth. The person who has lost teeth regains the ability to eat almost anything, and can smile with confidence, knowing that their teeth appear natural, and their facial contours are preserved. The implants themselves are titanium posts that are placed into the jawbone, where teeth are missing. The bone bonds around the titanium posts, creating a strong foundation. Artificial teeth are then constructed as crowns, bridges, or dentures.