In Germany, over 10,000 people are diagnosed with malignant tumors in the oral and pharyngeal regions each year. The significant delays in diagnosis often have dramatic consequences for the patient. Diseases of the oral mucosa fall within the treatment spectrum of practicing dentists. Careful monitoring of the oral cavity is the starting point for a prevention-oriented approach in dentistry. This concise textbook provides a comprehensive overview of the most common conditions of the oral mucosa. Diagnosis and therapy are explained succinctly. Symbols and graphics assist in the accurate classification of the respective findings. The informative images support quick and reliable diagnosis. The cases included in the book are also of etiological interest to internists, ENT specialists, dermatologists, and general practitioners.