Question: Does postnasal drip cause bad breath? If what doctor can assist with this problem? 

Answer: Yes, postnasal drip can cause bad breath. \n\nI would first recommend an over-the-counter saline solution or an antihistamine (if your postnasal drip is caused by allergies). \n\nIf this condition continues for a prolonged period, you should see a doctor. This could be a sign of a bacterial sinus infection. In this case, a doctor could easily prescribe antibiotics to alleviate the problem.
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