International Journal of Science, Engineering and TechnologyAuthors: C. Narayanan, Manash Gautam, P. Marimuthu, KA. Mohamed Yazid, Mohith Joshy
Abstract: Cardiovascular diseases (CVDs) remain the leading cause of mortality worldwide, necessitating continuous, non-invasive monitoring solutions. Existing wearable devices are limited to physical parameters and cannot assess biochemical markers critical for comprehensive cardiac assessment. This paper presents the Smart Oral Guard, a novel intraoral wearable device integrating colorimetric salivary biomarker analysis with photoplethysmography (PPG) for continuous cardiovascular health monitoring. Colorimetric test strips analyzed by a TCS34725 RGB optical sensor detect salivary pH, potassium (K⁺), and alpha-amylase (sAA), while a MAX30102 PPG sensor measures heart rate and heart rate variability (HRV) from the buccal mucosa. An ESP32 microcontroller processes and transmits data via Bluetooth Low Energy to a Flutter mobile application for real-time visualization. A Firebase cloud backend employs Random Forest machine learning to classify cardiovascular risk into Low, Moderate, and High categories with alert generation. The system is designed to be portable, cost-effective (approximately USD 60 in components), and user-friendly, bridging the gap between biochemical and physiological cardiac monitoring in a single, comfortable intraoral platform.
