Posts are small pillar-like structures meant to strengthen your tooth before capping.
Badly broken down or damaged teeth need root canal treatment. Such teeth are weak structurally and brittle and cannot support a cap unless strengthened. A ‘post’ made of metal of fiber is inserted into the treated root and strong core composite resin is packed. Quite like reinforcing concrete.
The core of the tooth is made into a solid, strong structure which can take the load of chewing when it is capped.
Posts are a bit more laborious during the clinical procedure but well worth the effort. It ensures the longevity of the crown on your tooth!