Citrogen, a gel containing 20% citric acid, serves multiple purposes in endodontics. It acts as a chelating agent for the removal of smear layers and conditioning of dentine surfaces. Its indications include:

Conditioning of Prepared Root Canal Systems: Citrogen is utilized to condition prepared root canal systems, enhancing the surface characteristics for subsequent procedures.
Removal of Mineral and Smear Layers: It effectively removes mineral and smear layers from root canal walls, promoting a clean and optimal environment for dental procedures.
Lubrication during Root Canal Preparation: Citrogen acts as a lubricating agent during root canal preparation, facilitating smoother instrumentation and reducing friction within the canal.
Conditioning of Dentine Surfaces: It is employed for the conditioning of dentine surfaces, ensuring proper adhesion and interaction with dental materials used in the root canal.