GSK, Corsodyl Mouthwash. Corsodyl treatment mouthwashes are antibacterial solutions containing chlorhexidine digluconate 0.2 percent w/v. Chlorhexidine digluconate has a dual action.. 1.It is an antibacterial ingredient that attacks and helps to kill the plaque bacteria that can cause your gum irritation. 2.It creates a protective layer over your teeth and gums for up to 12 hours, thus helping to prevent any new plaque forming. With its convenient and easy to use format, the mouthwash is also particularly useful when more than one area in the mouth needs attention. It is available in Mint or Original (Aniseed) flavours. As well as being used to treat and prevent gum disease, Corsodyl is used for the following conditions.. Mouth ulcers. Denture sore mouth. Oral thrush. Promote gum healing after dental surgery or treatment. Maintain mouth hygiene.