Demonstration of BIOral: Fabricating Intraoral pH Sensor for Continuous Health Monitoring

Oral pH is a key health indicator, playing a vital role in enamel protection and reflecting systemic conditions. However, existing devices for detecting pH are either one-time tests or require additional extraoral equipment, which fails to capture the dynamic changes in oral pH. This paper introduces BIOral, a novel system that integrates pH-sensitive hydrogel with dental braces for continuous oral pH monitoring. BIOral combines biocompatible dental braces, edible colorimetric hydrogel, and a digital color sensor to monitor salivary pH levels, offering a new approach to personalized oral care management. We present the fabrication process of BIOral and a preliminary technical evaluation to assess the system’s performance, reaction time and detection range. We envision BIOral as a cost-effective solution for daily use, and could advance preventive healthcare and facilitate early intervention.