Fiber post application has now become a frequently used method to prevent tooth loss. Thanks to the Fiber post method applied with a special technique, although its root is intact, it provides the protection of worn teeth. It is an alternative that is applied with direct root canal treatment and allows you to use your own teeth for many years with its permanence. The term post means nail and this nail-like material produced with a special material is placed up to the root through the channel opened in the tooth. Apart from integrating with the root, it aims to keep the tooth fixed and intact. At the same time, the name of this treatment can be referred to as Post-core. It can be applied together with various filling methods depending on the condition of the tooth.