The goal of this clinical trial is to learn if alpha binaural beat-embedded relaxing music reduces anxiety and stress in adolescents undergoing orthodontic bracket placement. It will also learn about the safety and effectiveness of music-based auditory interventions.

The main questions it aims to answer are:

Does alpha binaural beat music reduce anxiety levels during orthodontic bracket placement? Does music listening reduce physiologic stress parameters and salivary stress biomarkers? Is alpha binaural beat music more effective than relaxing music alone?

Researchers will compare alpha binaural beat music and relaxing music to a control condition (headphones without audio) to see if these interventions reduce anxiety and stress during orthodontic treatment.

Participants will:

Be randomly assigned to one of three groups: alpha binaural beat music, relaxing music, or control Listen to the assigned audio (or no audio) during orthodontic bracket placement Complete anxiety questionnaires before and after the procedure Undergo measurements of blood pressure, heart rate, respiratory rate, body temperature, and oxygen saturation Provide saliva samples before and after the procedure for analysis of cortisol, alpha-amylase, and pH levels

Inclusion Criteria:

• Adolescents aged 12 to 18 years
• Undergoing orthodontic treatment
• Scheduled for orthodontic bracket placement
• Provided written informed consent; for participants younger than 16 years, consent was also obtained from a parent or legal guardian

Exclusion Criteria:

• Age younger than 12 years or older than 18 years
• Significant medical history, including psychological disorders such as anxiety or depression, hearing problems, epilepsy, attention disorders, diabetes, hypertension, dry mouth, or other systemic chronic or endocrine diseases
• Use of psychiatric medications
• Use of biotin, antihistaminic drugs, or anticholinergic drugs
• Presence of oral lesions
• Unwillingness to continue or participate in the study