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.
Necrotizing Ulcerative Gingivitis (NUG). Necrotizing ulcerative gingivitis (NUG) is a condition affecting the gums that is caused by a bacterial infection. It is a form of periodontal (gum) disease.But unlike other forms, it typically develops quickly and causes moderate to severe pain.Necrotizing means that the condition destroys tissue.y your next visit, it is likely that the symptoms of NUG will have started to subside. Your dentist will clean the area more aggressively with a process called scaling and root planing. He or she will examine your other teeth to see if any are affected and will review your home-care instructions.