The bad breath after wisdom teeth extraction is probably due to the presence of wisdom teeth food impaction or wisdom teeth pericoronitis inflammation oozing triggered by the odor. 1. Food impaction. Wisdom teeth in the mouth if there is an obstruction, may cause food impaction, food fermentation in the teeth, while the bacteria reproduction will appear oral odor, when wisdom teeth extraction food impaction symptoms disappear, bad breath also disappear. 2. Wisdom tooth pericoronitis. If the wisdom teeth are blocked in the mouth, there may be wisdom teeth pericoronitis, the gums around the wisdom teeth are red and swollen with abnormal oozing, and in serious cases, there will be pus oozing out, which will emit bad odor under the action of bacteria. If the bad breath is gone after wisdom teeth removal, it is usually caused by the wisdom teeth, but if the odor still exists, it may be caused by other dental and periodontal diseases in the mouth.