In the current study, MOST approach is proposed, to engineer an oral health behavior modification intervention, to increase the engagement of mothers in brushing their pre-school children's teeth.

The first phase of this study will be the preparation phase. This will comprise the development of a conceptual framework and conducting a feasibility pilot study consisting of three intervention components: Motivational interviewing (MI), Oral health promotion messages (OHPm), and Storytelling (ST). The second phase of the study is the optimization phase which constitutes a factorial trial of the three selected intervention components (MI, OHPm and ST). Each component will be set at two levels: yes (the intervention is applied) vs no (the intervention is not applied).

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.