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Philips Sonicare

Philips Sonicare 4100 Series Electric Toothbrush - Sonic Toothbrush with Advanced Sonic Technology, Pressure Sensor, Two Intensity Settings, Smartimer & Quadpacer, White, Model HX3681/23

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Size: 1 Count (Pack of 1)


Color: White


Features

  • The C2 Optimal Plaque brush head with soft, flexible, stain-removal bristles helps whiten and polish your teeth; it also removes up to 700% better plaque than a manual toothbrush
  • Electric toothbrush for adults providing gentle yet effective cleaning: the Advanced Sonic Technology pulses fluid between teeth and along the gumline for even more effective oral care
  • Safe and gentle electric toothbrush with pressure sensor: if you apply too much pressure, the handle will pulse slightly, reminding you to ease off the pressure, protecting your teeth and gums
  • Optimize your routine: EasyStart for a gradual, gentle increase in brushing power, SmarTimer informing when you've reached 2 minutes, and QuadPacer to brush each section of a mouth for 30 seconds
  • Brush head replacement reminder tracks how often and how hard you brush, then notifies you when it's time to replace the brush head; dental professionals recommend changing your brush head regularly
  • Rechargeable toothbrush providing up to 14 days of regular brushing on a full charge
  • Philips Sonicare toothbrush from the #1 dental professional recommended sonic toothbrush brand worldwide2: benefit from Philips expertise to keep your teeth and gums in the best condition
  • The set includes: 1x Philips Sonicare 4100 Series electric toothbrush, 1x C2 Optimal Plaque brush head, 1x USB charger (power adaptor not included)

Description

Achieve 700% better plaque removal than with a manual toothbrush thanks to the Philips Sonicare 4100 Series sonic toothbrush paired with the C2 Optimal Plaque electric toothbrush head. Enjoy a powerful yet gentle clean, even in those hard-to-reach areas. The Advanced Sonic Technology provides gentle yet effective cleaning, pulsing fluid between teeth and along the gumline. With the built-in pressure sensor, you know when to adjust the pressure. Ease off and your gums will stay protected! To help you get used to the Sonicare experience, the EasyStart feature adjusts the power level of the toothbrush over the first 14 uses. Improve your brushing technique with QuadPacer and reach your recommended brushing time of 2 minutes with SmarTimer. Experience up to 14 days of regular brushing after a single charge, bringing a new level of convenience to your brushing routine (based on two periods of two-minute brushings per day on standard mode). Did you know that brush heads become less effective after three months? The replacement reminder tracks how often and how hard you brush, then reminds you to replace your brush head once it's time for a new one. ¹ vs. a manual toothbrush ² based on a study of over 2,600 dental professionals (dentists and hygienists) conducted in the United States, Canada, Japan, China, Korea, Thailand, Germany, the United Kingdom, Switzerland, France, Belgium, Austria, Italy, Spain, Sweden in 2022-2023

Brand: Philips Sonicare


Age Range (Description): Adult


Special Feature: Pressure Sensor,Brushing Timer,Rechargeable,Lightweight,Ergonomic


Power Source: Battery Powered


Item Firmness Description: Soft


Product Dimensions ‏ : ‎ 2.48 x 4.29 x 8.66 inches; 8.64 ounces


Item model number ‏ : ‎ HX3681/23


Batteries ‏ : ‎ 1 Lithium Ion batteries required. (included)


Date First Available ‏ : ‎ December 13, 2021


Manufacturer ‏ : ‎ Philips Sonicare


Best Sellers Rank: #296 in Health & Household (See Top 100 in Health & Household) #1 in Sonic Toothbrushes


#1 in Sonic Toothbrushes:


Customer Reviews: 4.3 4.3 out of 5 stars (53,520)


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: within 30 days

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Huge Upgrade From a Manual Toothbrush
Size: 1 Count (Pack of 1) Color: White
This toothbrush works great and leaves my teeth feeling super clean every time. It’s gentle on my gums, easy to use, and the battery lasts a long time. I’ve definitely noticed a difference since switching from a regular toothbrush. Great quality and well worth it.
Reviewed in the United States on February 4, 2026 by Steven S
    • This is a well made toothbrush.
Size: 1 Count (Pack of 1) Color: Black
I've been using $20-ish cheap knock-off sonic toothbrush. It's been working, but I got curious how Philips or Oral-B products are - they are definitely more expensive, and I've seen many good reviews on them. So here I tried this 4100 today for the first time. Definitely feeling the difference - garden hose vs fire hydrant. Brush head will be smaller then your expectation. This means you need to get busy brushing your entire teeth, but again the brush can reach to the deep area in your mouth = good for through cleaning. There are two levels of power you can control with a button. I am using the highest settings, works good. Timer feature is an added bonus. ... show more
Reviewed in the United States on February 8, 2026 by Edwin X
    • Not as weak as they say
Size: 1 Count (Pack of 1) Color: White
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
Review Image by Kirik Kirik
This is my 1st electric toothbrush. I ordered it over the oral b smart 1500 because it's cheaper and I found more people who swear by it than oral b. Later on, I read comments where people who have this 4100 for 10+ years say that the newer 2021 version has only half the power of the old version. Someone on reddit showed images of the inside of the new and old versions and the new version has a small plastic toy-like motor, while the old version has a big copper-wrapped motor and an old version user said "now I understand why the new version is lighter and less powerful". I was disappointed on the new version and tried to cancel the order but I couldn't. Once it came, I decided to try it and to my surprise, it brushes my teeth way better than my manual soft-bristled and hard-bristled toothbrushes(I use both manual brushes daily compared to my daily usage of the electric toothbrush 4100 C2 head of medium bristles. If you have gum sensitive issue, buy the S sensitive or G2 optimal brush head. If you want hard-bristled, buy W diamondclean brush head). I don't know how good the old version was but this newer version definitely brushes better than any manual toothbrush unfortunately it doesn't not come with a travel case. Update 5/16/2024: I bought the Oral B smart 1500 because it was on sale and I wanted to see how better it is compared to the sonicare. The oral B package looks nicer and bigger than the Sonicare but upon opening the smart 1500 package, I saw hair all over the toothbrush. I did read many customers saying on reddit that their Oral b toothbrush were repackaged, but I can't believe I'm a victim of this nastiness. It also took 2 weeks to reach me from Hawaii and since it says "made in China", I think the seller is located in China. I'll return this and I'll advise you to buy the Sonicare instead of the oral b if you don't want to be cheated receiving a used-repackaged toothbrush. Update 05/22/2024: On 05/17/24, I bought the Oral b smart clean 360 which has exact power as the smart 1500 that I returned but the smart 360 has 5 modes and a button to change the mode while the smart 1500 has 3 modes and no button to switch between the modes. The advantage of the oral b smart clean 360 is that the brush heads cost is cheaper than the Sonicare 4100 and I find it better at whitening my teeth than the Sonicare. That's all the advantages there. The things that I don't like with it are many, so I'm just going to name the most annoying ones: 1) The brush heads are too big compared to the Sonicare(see picture): Putting Oral b brush heads in my mouth is like putting a golf ball in my mouth(my head and mouth are wider than the average US male). 2) The brush heads have holes(see pictures) that trap saliva+toothpaste and creates more noise when the brush handle needle rotates in the presence of the liquid mixture, and moisture will be also trapped easily in the holes(most customers complain about Oral b brush heads design. Oral b corrected the needle issue with the IO version but the IO introduced a shallow hole which now traps moisture in the brush handle). When I'm using the Oral b with no choice but to have my mouth wide-open, it forces my mouth to produce more saliva which gets mixed with the toothpaste and enters the brush head and creates more noise. 3) Rattling noise: The Oral b smart clean 360 isn't as noisy as people say. It's the quality of the noise the problem. It's a very unpleasant rattling noise as if you're hearing an old car engine with broken parts in it. That noise gets worse when liquid enters the brush head holes. 4) The charger is not round like a perfect circle: You must put the Oral b brush handle in a specific position to charge it and if you place it wrong, it'll fall and might break. 5) The Daily Clean mode is rough and combined with the big brush head the experience is bad, but the smart clean 360 has more mode which make it smoother and better than the smart 1500 but not as good as the Sonicare 4100. 6)It has no auto-stop mode: You keep brushing without knowing how long you have been brushing your teeth. To summarize, the oral b non-IO brush heads are cheap but very badly designed for a pleasant toothbrushing. I won't recommend it if you're shorter than 6 foot tall or have a small mouth. ... show more
Reviewed in the United States on May 5, 2024 by Kirik Kirik
    • Good quality brush, but charge does not last as long as older model
Size: 1 Count (Pack of 1) Color: Black
It's working fine and does the job, but I do agree this model is smaller and the rechargeable battery does not last as long as my older model.
Reviewed in the United States on February 8, 2026 by tonytigerca
    • My Teeth Feel Like They’ve Been Polished by a Tiny, Enthusiastic Pit Crew
Size: 1 Count (Pack of 1) Color: White
I used to brush my teeth like a common laborer, moving my hand back and forth like I was trying to start a fire with two sticks. Then I bought the Philips Sonicare 4100. I realized within thirty seconds that I had been doing it wrong for thirty years. My mouth doesn't just feel clean; it feels like it’s been through a high-end car wash and then buffed with a microfiber cloth. Why Your Mouth Needs This Sonic Engine: The Vibrations of Victory: 62,000 brush movements per minute. If I tried to do that manually, my arm would fly off and hit the mirror. This thing creates a "microbubble" situation that reaches into crevices I didn't even know I possessed. The "Stop Pressing So Hard" Sensor: Apparently, I used to brush my teeth with the same intensity I use to scrub a cast-iron skillet. The 4100 has a pressure sensor that pulses when I’m being too aggressive. It’s like a gentle life coach for my gums. The Two-Minute Timer: I used to think two minutes was a long time. It turns out, my "manual" two minutes was actually about forty seconds. This brush keeps me honest. It’s the longest two minutes of my life, but my dentist’s inevitable praise will be worth it. Battery Life for Days: I charged this thing once, and I’m pretty sure it’s going to outlast my current lease. It’s the Energizer Bunny of dental hygiene. The Life Impact I combined this with my 1,000 RESHLIX Floss Picks, and I’m fairly certain my mouth is now the cleanest environment on the North American continent. I went to the dentist last week and he asked me if I’d recently had a professional cleaning. I just smiled—a blinding, sonic-powered smile—and walked out. Pros: My teeth are so smooth I can’t stop sliding my tongue over them. It’s slim, it’s sleek, and it makes my bathroom look like a futuristic spa. Cons: The vibration is so powerful that if you turn it on before it’s in your mouth, you will decorate your bathroom mirror with toothpaste art. You’ve been warned. ... show more
Reviewed in the United States on January 29, 2026 by CJ

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