Hi... Thanks for your query.. It is true that pericoronitis occurs if food gets lodged between wisdom tooth and the gum flap covering the wisdom tooth... And by food it does not mean that you see big food particles stuffed in there but it also means uncleaned area and bacterial growth below gum flap... It leads to inflammation of the flap leading to pain swelling and can cause difficulty in opening the mouth too.. The line of treatment is Antibiotics, Painkillers, Mouthwash but only this is not enough to you, you should go to dentist again and ask him to irrigate the area between gum flap and wisdom tooth with saline, betadine solution and hydrogen peroxide so that the area get disinfected and clean.. Other thing is do warm saline gargles,it will help you to reduce inflammation... Carry on with the course of your antibiotics and pain killers, your pain and swelling must go in two three days.. Once you get relieved of ur discomfort visit the dentist again and get an IOPAR (X ray) done to find out whether wisdom tooth will erupt to proper occlusion or is impacted (means having an obstruction and wont erupt to occlusion). If it is not impacted just get your gum flap removed known as OPERCULECTOMY and if impacted get your tooth extracted... This will be your ultimate treatment and finish your problem forever.. Hope you recover soon.. Thanks and regards.. Dr.Honey Nandwani Arora