Philips Sonicare 4100 Series Electric Toothbrush, Black, Model HX3681/24
A sonic electric toothbrush with a C2 Optimal Plaque Control brush head, two intensity settings and a built-in pressure sensor.
A sonic electric toothbrush with a C2 Optimal Plaque Control brush head, two intensity settings and a built-in pressure sensor. SmarTimer and QuadPacer pace a two-minute brush across four quadrants, and it charges over USB with up to 14 days of regular brushing per charge.
Sonic brushes use a longer, familiar head shape that vibrates side to side at high speed, which feels close to a manual brush and makes the switch easy. The two-week battery and USB charging suit travel, though the USB charger ships without a wall adapter and there is no travel case in the box.
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Check the current price on Amazon — prices change.
Last updated: November 9, 2026
Specifications
- Sonic
- 2 intensity settings
- pressure sensor
- up to 14 days per charge
Key specifications as stated on the Amazon listing.
What we like
- Well-priced entry to the Sonicare line with the core features included
- Two-week battery and USB charging suit travel
- Pressure sensor and quadrant pacing help build good habits
What to watch for
- Single cleaning mode with only two intensity levels
- No travel case in the box
- USB charger ships without a wall adapter
Key features
- Sonic technology with a C2 Optimal Plaque Control brush head
- Two intensity settings and a built-in pressure sensor
- SmarTimer and QuadPacer for a two-minute brush across four quadrants
- USB charger; up to 14 days of regular brushing per charge
Who should buy it
A well-priced entry to the Sonicare line with the core features included — timer, quadrant pacing, pressure sensor and two-week USB-charged battery.
Who should avoid it
Anyone wanting more than a single cleaning mode, or a travel case and wall adapter included in the box.
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