Why doesn't the new 4100 model have a regular plug ? why on gods green earth did they cheap out and put a usb plug in there ??

According to the review in WireCutter (Sept 2022), you can contact SonicCare and receive a free plug adapter. I've just ordered the 4100 on Amazon. I don't have the serial number yet, because the product doesn't arrive until tomorrow, but SonicCare customer service just told me that they would send the free plug adapter once I provide the model number and serial number to them. They confirmed there is no charnge. It will take 7-10 days to receive the plug adapter once I am able to provide them with the serial number. I'll do all of that after the product arrives tomorrow.

Does anybody make a single speed electric toothbrush? I'm so tired of cycling through the speeds

Cycling is the most effective way to brush each quadrant sufficiently.

What is the purpose of having two intensity modes? How do you know when you should use one or the other?

if you have more sensitive teeth and gums you can use the softer mode

What do the green and yellow lights mean? what about the beeping noise after the 2 minute brush? I thought low battery but is it replacement head?

Hi! When the brush head replacement reminder light of Philips Sonicare Toothbrush HX3681/24 lights up amber, kindly replace your brush head.

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Philips Sonicare 4100 Rechargeable Electric Toothbrush, 1 Brush Head, White

Product ID: 405354687

Details

Age Range (Description)
Adult
Brand
Philips
Item Firmness Description
Soft
Power Source
Corded
Special Feature
Pressure Timer

⚡14-day battery life

🦷700% better plaque removal

⏱️2-min SmartTimer & QuadPacer

Description

🦷 Elevate your oral care game—because your smile is your power move.

BRUSH HEAD IQ - Intelligent replacement reminder tracks usage and pressure, so you never miss when it’s time to swap heads.
PRESSURE PERFECT - Built-in pressure sensor gently pulses to protect gums from over-brushing—because your smile deserves care.
LONG LASTING POWER - Rechargeable battery delivers up to 14 days of cordless brushing freedom on a single charge.
PLAQUE GONE 7 X FASTER - Clinically proven to remove up to 700% more plaque than manual brushing for a radiant smile.
SMART BRUSHING ROUTINE - QuadPacer and SmartTimer ensure you hit every quadrant for the dentist-recommended 2 minutes.

The Philips Sonicare 4100 Rechargeable Electric Toothbrush combines advanced sonic technology with smart features like a pressure sensor, SmartTimer, and brush head replacement reminder. It removes up to 700% more plaque than manual brushes, offers up to 14 days of battery life, and is designed for gentle yet effective cleaning, making it the #1 dental professional recommended sonic toothbrush worldwide.

Specifications

Asin	B09LD8T445
Batteries	1 Lithium Ion batteries required. (included)
Best Sellers Rank	#1 in Sonic Toothbrushes
Date First Available	December 13, 2021
Item Model Number	HX3681/23
Manufacturer	Philips Sonicare
Product Dimensions	2.48 x 4.29 x 8.66 inches; 8.64 ounces

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