Sir today at 6 of clock my father teeth is paining it is right side last teeth I guess it is paining then at 7:30 we decide to go to a dentist but 2-3 clinic in our area is closed so we go to a medical store my father asked for one mouth wash hexadine which give instant full relief for 2 hrs then again after 2 hrs it is paining again after mouth wash with hexadine gives instant relief and my father gone for sleeping please tell why it is happening is there any serious iissue