All the reviews are from amazon vine voice. how can these be unbiased reviews? especially for something so expensive.

I am a Vine Voice reviewer and I still only gave it 3 stars. As a toothbrush it is great, and the carrying case is nice. But is it $200 BETTER than the model just below it? No, it is purely a "I am rich and want a rich person's toothbrush". Also, Vine Voices still have to pay taxes on the product received. In taxes this cost as much as the second best model, so Vine Voice folks are not going to get this and give it a highly rated review if they don't like it... at least I wouldn't.

Does Sonicare make a “compact size” replacement head for this toothbrush!

Hello! Yes, you may use the Philips Sonicare DiamondClean Compact Brush Heads HX6074/26 for the Philips Sonicare 9900 Prestige toothbrush.

How does this compare to the model 9700, what are the main differences?

Hello! The Philips Sonicare 9900 Prestige toothbrush is our most advanced electric toothbrush always gets you, sensing your brushing style and adapting to you as you clean with the Premium All-in-One brush head. Unlike the Philips Sonicare DiamondClean Smart series, the Prestige comes with Premium All-in-One brush head that is our all-time best and the only thing you need to achieve cleaner, whiter teeth and healthier gums. It comes with 1 button that has no visible gaps and it joins between the button and handle.

Can a brush charging with a previous version charger (9300 Glass charger)?. Is it compatible?

Yup!! I bought the 9900 for my girlfriend, the one with the glass charger for me (9750?). Her 9900 charges beautifully in my glass charger.

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✨ Elevate your smile game with AI-powered precision! ✨

TRAVEL READY POWER - Up to 14 days of battery life plus a sleek charging travel case keeps your smile flawless anywhere.
SMART PRESSURE SENSE - SenseIQ tech adjusts intensity 100x/sec to protect gums from overbrushing—your personal dental coach.
STAY ON TRACK WITH AI - Advanced app syncs to guide, track, and remind you when it’s time to swap brush heads—never miss a beat.
PLAQUE GONE 20 X FASTER - A3 Premium brush head removes 20x more plaque than manual brushing for a radiant smile.
TAILORED CLEAN YOUR WAY - 5 brushing modes + 3 intensity levels let you customize your routine for ultimate oral care.

The Philips Sonicare DiamondClean 9900 Prestige combines cutting-edge SenseIQ technology and an advanced AI app to deliver a personalized, professional-level clean. Featuring 5 brushing modes, 3 intensity levels, and a premium A3 brush head that removes up to 20x more plaque, it ensures healthier gums and whiter teeth. With up to 14 days of battery life and a convenient charging travel case, it’s designed for busy professionals who demand excellence on the go.