Bioxtra Dry Mouth Oral Gel (40ml). Helping encourage the flow of natural mouth moisture Promoting oral health by supplementing components present in natural saliva Facilitating improved mouth function Convenient and practical for daytime use.. A discrete way to use BioXtra Gel anytime and any place.. bioXtra Dry Mouth Oral Gel. bioXtra Dry Mouth Oral Gel acts as an effective substitute for natural saliva by regulating the microenvironment of the mouth. The unique formulation contains intensive moisturisers which soothe and lubricate for hours at a time and ease the symptoms and effects of dry mouth (xerostomia). It helps promote healthy teeth and comfortable gums.. Directions. Wash hands thoroughly before use. Apply gel liberally with your finger or a clean swab to gums and tongue or under dentures whenever mouth feels dry, especially at night. Remove or spit out the excess. Repeat as necessary. Close cap after use.