The author presents a classification of tumors of the mouth designed particularly for the dentist. The histologic, embryologic and biologic aspects of mouth tumors are discussed briefly, with occasional reference to radiosensitivity. Special emphasis is placed on tumors arising from the dental structures. The classifications of different authors are referred to. The discussion of pseudotumors is important in that it calls attention to certain unusual tumor-like lesions so frequently confused with true neoplasms. The presentation is brief and accurate and should form a useful guide to those particularly interested in the histopathology and more especially the histogenesis of tumors of the mouth.