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Health & Wellness
BrushBright
AI Smart Toothbrush based on nRF5340
Edge-AI toothbrush that maps brushing coverage in 3D and provides real-time oral hygiene scoring.
Coverage Accuracy
95%
Battery Life
21 Days
BrushBright
Client
An oral care company wanting to differentiate their electric toothbrush with real-time brushing quality analysis and personalized coaching.
Challenge
Reconstructing 3D brushing motion from a 6-axis IMU inside the brush handle and classifying which tooth surface (buccal, lingual, occlusal) is being brushed, all on a battery-powered MCU.
Product Concept & Architecture
The Nordic nRF5340 dual-core Cortex-M33 SoC handles both sensor processing and BLE communication. A Bosch BMI270 6-axis IMU captures motion at 400Hz. The handle houses a 40kHz sonic motor with a 3000mAh battery for 3 weeks of brushing.
Engineering Solution
We implemented a sensor fusion pipeline on the nRF5340's application core: IMU data → Madgwick filter for orientation → 3D trajectory reconstruction → surface classifier. The classifier is a small LSTM trained on 500 annotated brushing sessions, quantized to 200KB. Brushing coverage is mapped to a 16-zone mouth model and synced to the companion app via BLE after each session.
Result
95% accuracy in classifying brushed surfaces. Users improved coverage by 40% within 2 weeks of use. Dentist-verified plaque reduction of 35% vs. manual brushing.
Deep Tech FAQ
What makes the AI Smart Toothbrush based on nRF5340 unique?+
The AI Smart Toothbrush based on nRF5340 leverages custom hardware and edge AI to deliver industry-leading performance and efficiency.
What are the core technical benefits?+
Key benefits include low power consumption, real-time processing, robust connectivity, and a compact form factor tailored for deployment.
Can this architecture be adapted for other use cases?+
Absolutely. The underlying methodology is modular and can be retargeted for various applications with minimal redesign.
Project Profile
Services Delivered
Hardware DesignEmbedded Software
Core Technologies
BLETinyMLRTOS
Silicon & Vendors
NordicBosch
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