Definition of knack. 1  1 : a special ready capacity that is hard to analyze or teach. 2  2a : a clever trick or stratagemb : a clever way of doing something. 3  3 archaic : an ingenious device; broadly : toy, knickknack.
Medical Definition of gingivoplasty. plural. gingivoplasties. : a surgical procedure that involves reshaping the gums for aesthetic or functional purposes.
Gingivitis, the mildest form of periodontal disease, is an inflammatory process confined to the gums. It is caused by a nonspecific, long-term accumulation of plaque on the teeth and is usually reversible. Plaque-induced gingivitis is the most common form of the disease.2. Plaque is a sticky material that develops on the exposed portions of the teeth, consisting of bacteria, mucus, and food debris.