In the event a tooth develops a crack or a substantial cavity, beyond the capability of a root canal to fix, a crown is the best way to bring restoration and functionality back to the damaged and/or decayed tooth. Sometimes, the cavity will even extend into and under the gumline which makes the predictability of a standard crown's potential to be sufficient far too uncertain. Crown lengthening provides the best solution by allowing more of the tooth's structure to be restored in a comprehensive approach, granting the crown a stronger and more satisfactory hold.