Depending on the type of treatment you have received for your dental problem, it might be necessary to:
Have your tooth restored to its original size and shape
Supply additional physical support for the treated tooth
Get a complete "makeover" on the affected tooth
For cases like these, a crown is the most logical option. While inlays and onlays cover the chewing surface of the tooth and fillings fill in the empty interior space of the tooth, crowns completely cover every visible part of the tooth, which is why they are sometimes referred to as "caps". Most of your tooth remains but is essentially "rebuilt" to reassemble the tooth at its exterior best. While porcelain crowns certainly can improve the look of a tooth or multiple teeth, it is recommended only in conjunction with prior repair of the tooth, not simply for cosmetic purposes.