Philips Sonicare4100 Rechargeable Electric Toothbrush, with Pressure Sensor, 2 Intensity Settings, SmarTimer and QuadPacer, 14-Day Battery Life, White, Model HX3681/23

Happy with this purchase. The design works well and cleans teeth. It has a guard, where if you press too hard it warns you and then will shut off if you don't back off. It's durable and the battery holds long. Bristles are soft and comfortable. Found off brand replacements that are a perfect fit and work well.

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.

IV HAD THIS RECHARGEABLE TOOTHBRUSH LESS THAN A YEAR AND NEEDS BATTERY. I CAN NOT SEE A PLACE TO CHANGE BATTERY. The end of mine only had a tiny hole a coin would be to big to open as you suggested. There is NOT an opening or crack or line anywhere for an opening . All smooth surface . PLZ HELP

This 4100 model was purchased for a child to use. We have a few 5300 models that provide a travel case and maybe a few more options. The 4100 comes with a charging base, handle and one brush. Although it works well one negative is the charging base is USB so a USB to standard dual plug is needed to charge. The models with standard plug are preferred and available. The 5300 model mentioned has a standard plug base. The settings with this model are suitable. It has a long battery life. It's also a little more compact than some of the other models. The price is good for this model overall. You can find some of the higher models periodically.Aside from the features and charging capability the Sonicare is a quality brush that provides excellent cleaning. Everyone in our home loves using these and these kids after one use mentioned how much cleaner their teeth felt. According to dentists light brushing is more effecting than heavy pressure. The Sonicare vibration will halt signaling too much pressure. You really don't brush your teeth you hold the handle and slowly glide across your teeth. The Sonicare does all the work. I highly recommend these toothbrushes no matter which model you may choose.

I've been a sonicare user for years and upgraded my husband to this 4100 model - he loves it! There are 2 'power levels'. The simple features (like the 2-minute shut-off) are really nice. The only thing I wasn't prepared for was it comes with a charging base that ends in a USB - so if you don't have a USB outlet you will need a plug adaptor. There are plug adaptors sold on Amazon if you need one.