Does it develop mold in the area where the brush head connects to the handle? My very old one does.

Yup. Mold is a huge problem for mine; I've owned several versions. I found it was preventable by taking the brush head off to dry and clean it and the connector area after each use; but then, within a couple months, the strain of taking it off and on again so frequently seemed to break something in the base, and it no longer vibrated well. I ended up switching to a cheap knockoff from overseas, that nonetheless doesn't have the connection gap, and works great. Only problem now is I have no idea how I'll get replacement heads that fit...

What is the difference between this toothbrush and the sonice 2 series?

The 4100 has lithium battery, the series 2 uses NiMH. 4100 can be put on charger daily. Series 2 needs to have a drained battery before recharging. The 4100 also has a pressure sensor. I had the same question, and this is the response I got from Phillips.

Is this charger compatible with voltage range of 220V?

Hello! Yes, you shouldn't have any issues charging this toothbrush on your travels as long as the voltage of the outlet you're plugging into doesn't exceed 220V. The voltage for this particular Sonicare is 100-220V.

I purchased this in October and it's already broken. The head won't stay in place in the handle.What's the process of getting a replacement or refund?

I’m confused why so many people leave comments expecting amazon to monitor the comment section of every product- which is impossible- or - they ask questions not knowing how customer service works. Contact the company (Amazon), tell them there is a problem and return it. Amazon’s customer service number is on this website, or google “Amazon customer service number” and it shows up…then call it. Or use the help feature at the bottom of the page, click “need more help” and chose “chat with associate”. Unless you’ve been in a cave since 1990, this shouldn’t be this difficult. I hope this helps some people out, however firmly worded.

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🪥 Elevate Your Oral Care Game!

STAY ON SCHEDULE - BrushSync technology reminds you when it's time to replace your brush head for optimal performance.
TIMED TO PERFECTION - Quadpacer and Smart timer ensure you brush for the recommended 2 minutes, covering all quadrants.
TRANSFORM YOUR SMILE - Experience up to 7x more plaque removal compared to manual brushing!
POWER UP YOUR ROUTINE - Enjoy a robust 2-week battery life, so you're always ready to shine!
SMART PRESSURE PROTECTION - Built-in pressure sensor safeguards your gums from excess brushing force.

The Philips Sonicare ProtectiveClean 4100 is a rechargeable electric toothbrush designed to enhance your oral hygiene routine. It effectively removes up to 7 times more plaque than a manual toothbrush, features a pressure sensor to protect your gums, and includes smart reminders for brush head replacement. With a 2-week battery life and a timer to ensure proper brushing duration, this toothbrush is the perfect companion for a healthier smile.