In 1680 cases of alveolitis ("dry socket") the national economic-loss is more than 339,693.-marks. Nearly 3 million teeth will be extracted in one year in the DDR. By a valuation of nearly 3% of the alveolitis 90,000 patients have this complication. That will be a economic-loss of 18.1 million marks in one year. The prophylaxis of this complication is therefore a most important problem.