A crown is a fixed prosthetic device that is made in a laboratory and used by dentists to cover a damaged tooth. This improves the strength, appearance, shape and alignment of your teeth.
Bridges are also fixed prosthetic devices made in a laboratory. They are used to replace one or more missing teeth to fill in the gaps in your mouth. This prevents the remaining teeth from rotating or shifting into the empty spaces and resulting in a bad bite.
The discrepancy caused by missing teeth can also lead to gum disease and temporomandibular joint disorders (TMJ).