Emergency patients at the Department of Oral Surgery, University of Tokyo, during the three years from January 1990 to December 1992 were analyzed statistically. The results were as follows: 1. The total number of emergency patients was 209 and tended to increase with the advance in years. 2. There were a few more males than females and most of the patients ages were in the twenties. 3. The disease causes were dental caries or periodontal disease in 95 (45.5%), trauma in 58 (27.8%), and inflammation in 32 patients (15.3%). 4. It is clear that a system of oral emergency treatment is necessary.