596 acute odontogenic abscesses treated from 1974 to 1978 in the Freiburg Dental Clinic have been evaluated from the medical meteorological aspect (decimal classification). Retrospective study of coincidence led to the result that significantly more abscesses occurred on transition from anticyclonic weather conditions to cyclonic conditions with intensified advection of warm air, whereas in weather conditions with cold air advection the incidence of abscesses was distinctly reduced.