Pyralvex solution contains two active ingredients, salicyclic acid and rhubarb extract. Pyralvex solution is used to relieve the pain and discomfort caused by mouth ulcers and denture irritation. The solution also has some antimicrobial properties that help prevent the irritated areas from getting infected. The solution should be applied to the sore area of the mouth three to four times daily using the brush provided. Avoid rinsing the mouth or eating for 15 minutes after application.