Orthodontic patients face unique challenges in maintaining optimal oral hygiene due to the presence of fixed orthodontic appliances, which tend to increase plaque retention, leading to gingival inflammation. Oral Health Literacy (OHL) plays a role in an individual's ability to understand and implement oral hygiene instructions effectively. Mobile oral health interventions involve the use of mobile technology such as smartphones to improve oral hygiene practices and outcomes.

Aim of the study: To assess the effectiveness of a mobile oral health intervention using WhatsApp messages as compared to standard oral hygiene instructions on oral hygiene status and OHL level among orthodontic patients.

Inclusion Criteria:

1. Patients undergoing orthodontic treatment with fixed appliances in both arches for the first time.
2. Patients between the age of 16 and 25 years.
3. Participants must own a smartphone with WhatsApp installed.
4. Those who agree to be part of the research project and accept the informed consent.

Exclusion Criteria:

1. The presence of systemic diseases affecting oral health.
2. Patients with cleft lip and/or palate.
3. Functional and orthognathic patients.
4. Previous orthodontic treatment.
5. Patients with a removable appliance.