Apart from keeping up with good oral hygiene and doing salt water rinses, is there anything I can do for DD2? She's had a mouth ulcer for a couple of days and it is getting more painful. She is managing to eat but finding it increasingly painful. I can't find any mouth ulcer treatment for a five year old by looking online and the local pharmacy closed ten mins ago. I can drive out to another pharmacy if there is something that I can give her.