What is Corsodyl 0.2% Mouthwash used for? Corsodyl 0.2% is a medicated mouthwash for short-term use. The active ingredient is chlorhexidine digluconate, which is an antibacterial agent that helps to reduce the formation of dental plaque on your teeth. Corsodyl mouthwash helps to: Treat and prevent the early signs of gum disease (such as swollen or bleeding gums) Promote gum healing after dental surgery or other treatment Control mouth ulcers Maintain mouth hygiene, leaving your mouth feeling fresh and clean Manage oral thrush and denture sores Always read the label.