2 year warranty
HX3681/24
HX369BK
Goodbye manual toothbrush. Hello Sonicare.
Sonicare technology combined with our brush action gently removes 7x more plaque than a manual toothbrush.

#1 Dental Professional recommended sonic toothbrush brand worldwide
Sonicare technology
QuadPacer and SmarTimer
Slim ergonomic design
14-day battery life
Sonicare electric toothbrush with advanced unique technology is clinically proven to remove up to 7x more plaque from your teeth and along the gum line while protecting your gums.
Built-in pressure sensor automatically detects pressure you apply, warns you, and reduces the toothbrush vibrations automatically to help protect your gums. The toothbrush will make a pulsing sound as a reminder to ease off the pressure. 7 out of 10 people found this feature helped them become better brushers.
2 minute SmarTimer and 30-second QuadPacer guide you to brush for the recommended time in all areas of your mouth to ensure a complete clean.
4.3
of 5
3069
Reviews
86%
recommend this product
ChrisfromPA
30/09/2026
US
Part of promotion
Verified buyer
Repeat customer
I appreciate my Sonic. My hygienist says I don't need all of the fancy features on the more expensive models, plus my last button on my Sonic handled two years of use, so more buttons and features aren't what I am looking for. I went to my dentist yesterday and he said that whatever I am doing for mouth health I should continue doing. I have been using Sonic electric toothbrushes for twenty years.
This review was made for 4100 Series HX3681/23 Sonic electric toothbrush
Date of Use 2026-06-21
This review was made for 4100 Series HX3681/23 Sonic electric toothbrush
Date of Use 2026-06-21
SmileyJack
29/09/2026
US
Part of promotion
Verified buyer
WORKS PERFECTLY - TEETH AND GUMS FEEL CLEANER
This is the third Norelco Sonic toothbrush I have owend. After many years of good service, the other two batteries finally wore out. The 4100 series is, of course, an advanced version of the ones I used befrore and has been performing even better. I am very pleased with this purchase and expect better dental reports as it has been over 5 years since the previous one finally would not accept a battery charge - the batteries are not replaceable (sealed). While the Owner's Manual states that you can leave the brush on the charger, I had done that with the first two and I think that is why the batteries eventually built up a resistance to continued charging. This one is allowed to sit on the counter (flat bottom is stable and the brush air dries). On the first charge, I got 3 weeks of daily use before it indicated a need for a recharge.
Yes, I recommend this product
This review was made for 4100 Series HX3681/23 Sonic electric toothbrush
Date of Use 2026-07-29
Yes, I recommend this product
This review was made for 4100 Series HX3681/23 Sonic electric toothbrush
Date of Use 2026-07-29
All taken
25/09/2026
US
Part of promotion
Verified buyer
It’s a great product I have tried the other brands this one vibrates at a sonic speed, it’s slim, it has no ridges on the handle that traps toothpaste and crud, and the battery last almost a week without having to constantly put back on the charger
This review was made for 4100 Series HX3681/24 Sonic electric toothbrush
Date of Use 2026-08-01
This review was made for 4100 Series HX3681/24 Sonic electric toothbrush
Date of Use 2026-08-01
vs manual toothbrush for healthier teeth and gums
Data on file
based on two periods of two-minute brushings per day on standard mode