Igl Gel Igl Gel is a treatment for fast, effective relief from the pain of common mouth ulcers, sore gums and denture rubbing. Suitable for adults and children over 7 years, it works in three ways:It forms a gel coating to protect the sensitive and delicate area of the mouth lining as it heals.It contains lidocaine hydrochloride, a local anaesthetic to stop the pain.It contains aminoacridine hydrochloride, an antiseptic to prevent infection.