Comparative evaluation of efficacy of 4% tulsi extract (Ocimum sanctum), fluoridated and placebo dentifrices against gingivitis and plaque among 14–15 years school children in Davangere City, India – A triple blinded randomized clinical trial - Bhuvaneshwari Gangadharamurthy Nadar (Wolters Kluwer Medknow Publications, 2020)