The present study will be conducted by the department of Public Health Dentistry, Sharad Pawar Dental College, Sawangi. Inclusion Criteria : Age- 17-19 years. Moderate gingivitis and fair plaque score as measured by gingival index and plaque index. Exclusion criteria: Not willing to participate in the study. Prepared questionnaire will be solved by the selected subjects. If required, the investigator will help in understanding the questions to the selected subjects. The two groups will be: Group A- mhealth intervention for oral health education, Group B- conventional oral health education. The mhealth intervention includes oral health education by conventional method using placards and demonstration along with informative messages on mobile application. The details about the oral hygiene practice of the adolescent, the method of brushing, the ill effects of poor oral hygiene and their previous dental visits if any for both the groups will be recorded. The mHealth  means the mobile application will be used that contain the details about the oral hygiene practices required that includes the proper brushing technique , the method of brushing and the consequences of improper oral hygiene. The other group will given oral health education by conventional method using placards and demonstration. The questionnaire will be used to evaluate and compare knowledge pre and post intervention at baseline, 1 month and 3 months. The oral hygiene will be evaluated through the Turesky-Gilmore-Glickman Modification of the Quigley Hein Plaque Index and gingival Index given by Loe H and Silness J at baseline, 1 month and 3 months.