Effect of Optimized Behavioural Intervention Using The Multi-Phase Optimization Strategy (MOST).

Inclusion Criteria for mother's of children enrolled in study: * Has children between 2 and \<5 years of age * Has children with high plaque index scores (PlI≥2 or visible plaque accumulation on maxillary anterior teeth). * Literate and owns a mobile phone with already set-up or possibility to set-up Whats-App messenger application. * Willing to participate in the study and receive periodic OHPm and ST videos. Exclusion Criteria: * Mothers of children who are not willing to cooperate and show a definite negative behavior (Rating 1 Frankel's classification). * Mothers of children who are physically disabled or medically compromised. * Mothers of children in need of emergency dental treatments.