Abstract- Teeth is one tool in the human digestive system that serves as a food destroyer for easy digestion. Diseases that attack teeth can inhibit this activity and ca not be identified rapidly by young dentist. This problem can be solved with identification system. This identification system uses FIS Tsukamoto in analyzing. Subjective function of the membership of this fuzzy then solved by optimizing the membership function produces optimal results from system using FIS Tsukamoto with the highest accuracy of 89% from 100 testing data.