The purpose of this study was to develop and test a smartphone application (app) prototype, ToothSense, as an oral health promotion tool for the prevention of Early Childhood Caries (ECC) based on the Theory of Planned Behavior (TPB). A quantitative and qualitative design process based on the TPB was used for the app development in the first phase of the study. A behavioral intervention technologic model was used to document the app features design, accounting for Doshi's intervention strategies for the TPB. Beta-testing of the app was hosted via an online software program. Testers were presented with a series of tasks and prompts followed by a 5-point Likert-scale questionnaire that quantitatively measured perceptions of the app's interactive design based on Jakob Nielsen's principles and behavioral strategies. A Net Promotor Score was calculated to determine the tester's likelihood to recommend the app prototype. Audio and video aspects of the app were qualitatively measured using a template approach. Beta testers agreed the app met the majority of the five usability statements. The Net Promotor Score indicated a likelihood to recommend the app prototype. Thematic analyses revealed the following themes: interface design, navigation, terminology, information, and oral health promotion. Beta testing results from this study provided health promotion project design information for the prevention of ECC using the TPB and highlighted the importance and usability of smartphone app for oral health promotion.
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