I'm having mouth sore for the previous 3 weeks , at first it was very much swollen and it used to pain while eating and brushing teeth , i used to apply quick kool gel and the pain went away as well as the swelling decreased , but a small sore remains there. I am having vitamin c and B complex tablets but nothing is helping to exterminate the sore completely . Another sore is there on the left cheek at the same position as on the right cheek . I am talking about the inside cheek. It is painless