Age estimation plays an important role in many fields, such as forensic science and sports medicine. Compared with skeletal maturity, the development of teeth is less affected by the environment, and dental age is related to the development and mineralization of different growth stages. Therefore, the dental age is crucial for individual’s age estimation. The paper reviews several methods of dental age estimation, such as those of morphology, biochemistry and radiology, as well as the application, and reviews scope and limitations of the methods.