Definition: It is as an apical displacement of gingival margins from CEJ, which results in root exposure. Causes: Bone anatomy, tooth position, orthodontic movements, Improper tooth brushing, High frenum attachment, Calculus, Active periodontal disease, Smoking

Millers Classification:

	Class I: Marginal tissue recession not extending to the MGJ. No loss of interdental bone/soft tissue.
	Class II: MTR extending to / or beyond MGJ. No loss of interdental bone/ soft tissue.
	Class III: MTR extending to / or beyond MGJ. Loss of bone/ soft tissue, apical to CEJ, but coronal to level of recession defect.
	Class IV: MTR extending to or beyond the MGJ. Loss of bone or soft tissue apical to the level of the recession defect.