Gums can recede for several reasons such as physical trauma, tooth positioning & aging. Grafting is the process in which a piece of gum is resected from the palate & then placed in another part of the mouth halting rapid recession with a firmer type of tissue.
Clinical photos showing recession (receding gums) pre-op & healing post op after the placement of subepithial connective tissue:
Clinical photos showing recession (receding gums) pre-op & healing post-op after the placement of a free gingival graft:
