Fillings are the first choice for filling in a cavity. However, sometimes the tooth has become too damaged or fractured to be able to hold a filling. If this occurs with your tooth, your dentist will recommend a crown as a solution to this problem. This can help save your tooth from further damage, and is the prime medical purpose for crowns.
However, there are also cosmetic benefits to crowns. Crowns can restore and even out the top of the tooth, strengthening the tooth by encasing it in metal or ceramic giving it a straighter look. Using developing technology, the teeth have a natural looking and translucent look so no one can even tell you have crowns.