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Philips Sonicare
Philips Sonicare Power Flosser & Toothbrush System 7000, HX3921/40 Power Flosser 7000 + Toothbrush System
4.1
Based on 1,558 reviewsReal-World Testing
30 days of real-world testing
Recently Updated
Updated Nov 17, 2025
Technical Specifications
Complete product details
- Product Dimensions
- 8.62 x 7.48 x 10.43 inches; 3.27 Pounds
- Item model number
- HX3921/40
- Date First Available
- March 1, 2020
- Manufacturer
- Philips Sonicare
- ASIN
- B08LJ6CBSW
- Best Sellers Rank
- See Top 100 in Health & Household
- Brand
- Philips Sonicare
- Power Source
- Battery Powered
- Special Feature
- Bluetooth Connectivity
- Product Benefits
- "Up to 270% more effective than manual toothbrush and floss for healthier gums.", "Creates four wide streams of water for a thorough clean between the teeth and along the gum line.", "Gentle pulses of water guide you from tooth to tooth so that you won't miss a spot." See more
- Unit Count
- 1 Count
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About the Author
Expert analysis by Skyler Denham
Skyler Denham
Expert ReviewerStaff Writer
Skyler evaluates air‑quality monitors, water tests, and safety gear for Review Atlas. They translate standards into practical picks and remind readers when professional testing beats DIY. Accuracy and peace of mind drive their recommendations.
Industrial ScientificHealth Personal Care
View Full ProfileHow We Tested This Product
Our rigorous, independent testing process
Testing Period
30 days
Tested By
Skyler Denham
Our Testing Process
- We purchase all products at full retail price to ensure unbiased testing
- Products are tested in real-world conditions matching everyday use
- Our experts conduct both objective measurements and subjective evaluations
- Reviews are regularly updated as new products enter the market
- Tested according to our Beauty & Personal Care testing methodology
Last updated: November 17, 2025
|Independently tested and reviewed