A tooth can lose its normal shape and size for a variety of reasons. A crown covers your tooth to help restore its original shape and size. Crowns can also be used to make teeth stronger and look better. Crowns have a variety of uses. In some cases that require a large filling, there isn’t enough tooth remaining to keep the filling in place. A crown can strengthen the tooth and hold the filling. Crowns can also protect teeth that are weak, or help fix ones that are broken. Discolored or misshaped teeth can be covered by a crown, as can dental implants.