A prospective study was carried out to assess the role of salivary NO levels in etiopathogenesis of OLP, and to further correlate the levels of salivary NO levels with mast cell (MC) count. The study also evaluated the role of psychological factors in etiopathogenesis of OLP using DAS (Depression anxiety and stress) Scale. The sections were stained with toludine blue. The number and types of mast cells were assessed, and then correlated with the increased salivary NO level further reviewing the role of mast cells in the etiopathogenesis of OLP.The following conclusions can be proposed: Free...