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PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24
PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24

CONDITION: Open Box

Item is in open or damaged packaging and has not been tested. Item may show signs of handling and may be missing parts or accessories.

Returns Accepted

We accept returns under specific cicumstances.
See return policy for details

PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24

4.4 stars

PHILIPS SONICARE 410... see more >

Open Box
Returns Accepted

Current Bid

$9.99

4 Bidders
MSRP $39.99
Bidding has ended. Bidding has ended

This auction has ended.


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


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Philbert
on May 19, 2026

This is a great but inexpensive electric toothbrush. My old one just slowed down too much after 9 years of usage so got this lesser model that is $50 less and am glad I did. My teeth got rejuvenated again because the speed intensity increased and it works perfectly with my new Ollie toothpaste with Hydroxyapatite that everybody SHOULD be using.

Zac
on May 1, 2026

Purchased two of these as of now, and am very impressed! First was purchased about two years ago when my previous Sonicare finally died after 6 years of use.This is a relatively lightweight toothbrush when compared with other models as well as other brands. The vibration doesn't skimp, and it's the perfect minimalist Sonicare! Battery has a solid life, it maintains power, and the replaceable heads are your standard format.Overall, thoroughly impressed! The only downside for this model is if I leave the toothbrush upright the head eventually sticks to the body and prevents it from vibrating - an issues I nor my family has ever had with other models. All it takes is a simply clean of the head or (what I've been doing) is laying it down horizontal to dry at night.Highly recommended!

September Morne
on June 1, 2026

I used Sonicare for years but started buying less expensive toothbrushes. I wasn’t happy with most of them and was surprised to see a Sonicare toothbrush at this price. It had good reviews so I purchased one. It works really well. The toothbrush head is small enough that I can get it to my back teeth and the built in timer lets me know that I’m brushing long enough. My teeth feel cleaner and look whiter so it is definitely worth the price.

KVN
on

My wife and I both share the base and use separate heads daily. This review reflects this type of usage.1.5 years update:The battery charges normally and lasts several days between the both of us before needing a fresh charge.The clean feel after brushing is nice on either strength setting.We love the timing beeps that remind you to brush a new area.The base part charges fine, but the start button no longer functions because the rubber waterproof cover slightly ripped and water nuked it :(The unit performed flawlessly for 2 people of daily use for 1.5 years. 18 months. So we bought it for $40 with multiple heads to replace. That equates to about $1.11 per user during that time before it died. That’s better than any manual brush of similar quality. Not bad. I wish I could repair the button, but it’s built to be disposable after its useful lifespan.

Carissa Mefford
on April 17, 2026

​The Bottom Line​If you’re looking for a solid electric toothbrush that just works without a bunch of fancy (and expensive) apps, this Sonicare is a great pick. It’s simple, tough, and gets the job done without breaking the bank.​What’s to Like?​Serious Power: You can really see the vibration intensity when you get the brush head near water. It’s got plenty of "oomph" to make your teeth feel way cleaner than a regular manual brush.​Super Simple: There’s one button. That’s it. You don’t need a manual to figure out how to turn it on or use it.​Smart Reminders: Even though it’s basic, it’s smart enough to have little lights at the bottom that tell you when the battery is low or when it’s time to swap out the brush head.​Travel-Friendly: The heads snap on and off easily, and they come with these handy little plastic caps to keep the bristles clean in your bag.​The Trade-offs​Basic Vibes: It doesn’t have different modes (like "whitening" or "sensitive") or a pressure sensor that beeps at you if you’re pressing too hard.​Classic Design: It’s not the quietest thing in the world, but that’s just the trade-off for that high-intensity cleaning power.​Final Thought:This is the "Old Reliable" of toothbrushes. It’s got a nice weight to it, feels high-quality in your hand, and focuses on actually cleaning your teeth rather than having a bunch of tech you’ll never use. Definitely worth the buy!

OhioBabs
on June 4, 2026

When I've made an effort (and it was an effort) to brush with any previous electronic toothbrush, I always got a better report from my hygienist, what with my dry mouth, mild recession, root exposure, a bridge, and implants, I would often default to my handy manual brush. I had had a Sonicare about 20 years ago, but it was jarring so I seldom got used to it. So when my very pretty rose-gold Burst quit (it probably just needs a new lithium battery), I did a deep dive to find an electric toothbrush suited to my 77-year-old dentition. I walked with two hygienists, read several reviews, and then had a chat with AI. Voila! Dependable Philliips Sonicare kept coming to the fore. Two intensity settings, a pressure sensor so I don't push too hard, and for a little extra cost, I could add this amazing brush head (S2) for my delicate tissues! No need to get used to it. Just started brushing with my fluoride toothpaste (thank you, dry mouth) and was astonished. After the third brush, I feel as if I've been to see my hygienist and had a polish. And according to my AI pal, I didn't need the $100 version; the $40 version would do. So now, I'll be reaching for the electric brush throughout the day.

iamoverrated
on June 22, 2025

Dateline: A Bathroom Sink, Under the Unforgiving Glare of the Vanity Lights. For years, the act of brushing your teeth has been a sleepy, half-conscious affair. A dull, buzzing ritual performed on autopilot before you either face the horrors of the day or collapse into bed. You thought you knew what an electric toothbrush felt like. You were wrong. You were living a lie.I am here to tell you about the Philips Sonicare 4100. And I am here to tell you that it is a different beast entirely.It sits in your hand with a comfortable, substantial heft—a proper tool, not some flimsy, skinny wand. The handle is sturdy, the build quality immaculate. It feels like a serious instrument for a serious job. I applied the paste, brought the brush to my teeth with the casual indifference born of long habit, and thumbed the power button.And was immediately jolted awake by a profound, high-frequency thrum.This was not the gentle back-and-forth of a lesser brush. This was a jump scare. A sudden, powerful hum that felt like I was holding a swarm of microscopic, hyper-caffeinated jackhammers against my teeth. This is the "sonic" part of the name, a technology that vibrates with a speed and intensity that is both shocking and deeply, profoundly effective. You can feel the difference. It's a sensation of being deep-cleaned, of having years of coffee stains and bad decisions power-washed into oblivion.There are smart features, of course. A pressure sensor that gently chides you if you're pressing too hard, a built-in coach to keep you from savaging your own gums. A timer that dutifully guides you through the quadrants of your mouth. The included cap for the brush head is a simple, welcome touch of practical genius.But we must address the one, single, baffling decision that holds this marvel back from pure, unadulterated perfection: the charger. In a world that has finally, blessedly, begun to standardize around the glorious, universal USB-C port, Philips has chosen to tether this futuristic cleaning wand to a proprietary, old-world charging base. It is a strange, frustrating relic, a small annoyance that requires its own dedicated spot on your counter, unable to join the happy family of your other modern chargers.Even so, that one grievance is a whisper in the face of the roaring, high-frequency hurricane of cleaning power this toothbrush provides. The Sonicare 4100 is an impressive, powerful, and brilliantly effective piece of technology. It transforms the most mundane of daily chores into a high-performance event. A five-star champion that will leave your mouth feeling cleaner than you ever thought possible.

Froggy81
on April 1, 2026

We bought three of these electric toothbrushes on sale during Christmas time. Two of the three still hold a great charge but one seems to not hold a charge more than a few days. When they work, they are great brushes and the heads are nice sized to fit in any position around your mouth. Only difficult to reach spot is very back tooth on top and bottom

Dr VINODKUMAR
on April 12, 2026

Prevents plaque buildup. Absolutely the best. Buy it if you can afford it. Will save a lot more in dental bills, especially if you have irregular teeth.

wissam hourani
on November 4, 2025

سهلة الاستخدام ، قوية وفعالة ، خفيفة.

Hend
on May 3, 2025

يمكن انا ما احب الطنين ولكن ممكن تناسب البعض الفرشاة ممتازة وتنشحن وتبقى فترة طويلة جداً

Antonio Henrique
on May 13, 2026

Limpa bem

Jen
on April 1, 2026

Great product

  • Product Dimensions

    2.48 x 4.29 x 8.66 inches; 8.64 ounces
  • Item model number

    HX3681/24
  • Batteries

    1 Lithium Ion batteries required. (included)
  • Date First Available

    December 13, 2021
  • Manufacturer

    Philips Sonicare
  • ASIN

    B09LD7WRVS
  • Best Sellers Rank

    See Top 100 in Health & Household
  • Brand Name

    Philips Sonicare
  • Age Range Description

    Adult
  • Included Components

    1 Philips Sonicare 4100 handle, 1 Optimal Plaque Control (C2) brush head, 1 charger
  • Model Name

    4100 Series
  • Target Audience

    Boys, Girls, Unisex-Adults, Unisex-Kids
  • Package Type Name

    Box
  • Global Trade Identification Number

    00075020100764
  • UPC

    075020100764
  • Manufacturer Part Number

    HX3681/24
  • Model Number

    HX3681/24
  • Other Special Features of the Product

    Pressure Sensor,Brushing Timer,Rechargeable,Lightweight,Ergonomic
  • Power Source

    Battery Powered
  • Item Firmness Description

    Soft
  • Toothbrush Head Shape

    Round
  • Operation Mode

    Electric
  • Number of settings

    2
  • Reusability

    Reusable
  • Mount Motion

    Pulsate
  • Number of Items

    1
  • Unit Count

    1 Count
  • Number of Pieces

    1
  • Item Dimensions

    2.48 x 4.29 x 8.66 inches
  • Item Weight

    8.64 ounces
  • Material Features

    Rechargeable
  • Bristle Material

    Nylon
  • Handle Material

    Plastic
  • Color

    Black
  • Recent Sales

    20K+ bought in past month

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Store Auction Lots Condition

All items are uninspected and the condition is unknown unless otherwise explicitly stated. Items labeled as “Open Box” may have been previously opened, handled, returned, or repackaged. Packaging may be damaged, incomplete, or missing, and items may show signs of handling or cosmetic wear. Items are not tested unless specifically noted. Individual items are available for inspection at Korting Outlet located at 159 1st Court, Grand Rapids, Michigan 49534 during store hours.

The highest bids serve as legally binding contracts, and all sales are considered final. Items are sold on an “as is” basis, without any guarantees, warranties, or the possibility of refunds, whether written, expressed, or implied. The operational condition of an item may not be known or listed in the item description. While we may provide information on the condition of some items, including items marked as “New,” such information is not guaranteed.

All items are sold with all faults and without any warranty, whether expressed or implied, regarding merchantability or fitness for a particular purpose. The sale is conducted on an “as is, where is” basis with all faults. Buyers are strongly encouraged to physically inspect items before placing bids during the inspection period. Once submitted, bids cannot be withdrawn before, during, or after the auction for any reason.

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Posted closing times are in Eastern Time and may be extended through dynamic bidding. Dynamic bidding extends the auction close time until there are five minutes without bidding activity. Korting reserves the right to close early or extend auctions at its discretion.

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Payments will be processed through Stripe.

Refund Policy

Due to the nature of liquidation merchandise, returns are accepted only under the following circumstances:

  • Wrong item received
  • Major undisclosed damage that significantly affects functionality or value
  • Item arrives nonfunctional or dead on arrival (unless listed as untested, for parts, or salvage)
  • Missing critical components necessary for basic operation that were not disclosed in the listing
  • Counterfeit items or items materially different from the listing description

The following conditions are not eligible for return or refund:

  • Buyer’s remorse or accidental purchases
  • Minor cosmetic wear, scratches, dents, scuffs, or signs of prior handling
  • Damaged, worn, or missing retail packaging
  • Compatibility issues with buyer equipment, software, or intended use
  • Missing non-essential accessories, manuals, inserts, cables, or packaging materials unless specifically stated in the listing

All return requests must be submitted within 72 hours of delivery and include clear photos and/or video documentation of the issue. We reserve the right to deny returns that do not meet the above criteria.

.

Sales Tax

All orders are subject to the 6% Michigan sales tax. Tax-exempt buyers must have a current tax-exempt certificate on file before sales tax can be removed from an invoice.

Failure to Pay or Remove Items

Korting reserves the right to charge a 15% non-refundable restocking fee for items not paid for and picked up within seven days of the auction closing. Such items will be considered abandoned and forfeited to Korting. Korting may resell any abandoned or forfeited items.

PHILIPS SONICARE 4100 SERIES ELECTRIC TOOTHBRUSH – SONIC TOOTHBRUSH WITH ADVANCED SONIC TECHNOLOGY, PRESSURE SENSOR, TWO INTENSITY SETTINGS, SMARTIMER & QUADPACER, BLACK, MODEL HX3681/24