Apply some oral anlagesic antiseptic gel over the gums for 2-3 days, twice or thrice daily. Also use betadine gargles for 2-3 days. It will subside but if the problem persists beyond 3-4 days than visit a dentist. Also use soft bristles tooth brush and brush very gently for couple of days keeping in mind the proper brushing technique. For more info on brushing technique you can visit the link..... http://www.identalhub.com/articlecategory-brushing-techniques-8.aspx