LTF and oral lichen planus: The mean salivary lactoferrin concentration in the healthy volunteers, OLP patients before topical 0.1% FAO treatment, and OLP patients after topical 0.1% FAO treatment was 2.36 ± 1.05, 3.49 ± 2.52, and 2.10 ± 0.88 ng/ml, respectively.