Background: Despite the role that all causes can play in both gum and dental injury returning from problems, the vast majority of dental pain is due to caries. And because prevention is better than cure, taking care of oral hygiene is the best way to face gum problems and toothache For a person’s teeth without them, no one can eat or chew food or even speak letters and speech correctly, they are teeth which are considered to be from the solid parts of the body where they consist of collagen proteins and some minerals such as calcium. Objectives: This paper will solve the problems of treatment of tooth through correct diagnosis and treatment. Methods: In this research, we provide an expert system for the diagnosis of tooth which will help doctors to explore everything related to the problems of tooth. We look forward to providing simplified answers to tooth.