Teeth with large fillings are weaker thus more likely to crack or even splinter under pressure. The outcome can be terminal at times, which leaves no other option but to remove the tooth out. Crowns will protect such weak tooth as it surrounds the tooth, so that we can still enjoy the food we love without worrying when the tooth is going to crumble.
A bridge is one of the options of replacing a missing tooth. It involves making crowns either on one or both sides of the missing tooth, then a false tooth will be attached to the crowns to replace the missing tooth.