Philips Sonicare Next-Gen DiamondClean 9900 Prestige Electric Toothbrush

Price: $379.99
(as of Sep 17, 2026 15:47:52 UTC – Details)


Experience a next-level clean with the Philips Sonicare Next-Generation DiamondClean 9900 Prestige. This rechargeable toothbrush senses and adapts to your unique brushing routine, delivering real-time personalized guidance.

Gently remove 2000% more plaque¹, enjoy up to 1500% healthier gums², and achieve up to 100% more stain removal in less than two days¹.

This sonic toothbrush features smart coverage feedback, which helps you achieve a complete clean by providing real-time guidance. The light ring glows yellow when an area of your mouth needs cleaning and blue once an area is cleaned. After your brushing session, post-brushing feedback on the handle’s display shows any areas that need a retouch.

SenseIQ adaptive intensity automatically adjusts to your brushing style, sensing pressure, motion, and coverage up to 100 times per second. If you brush too hard, the intensity reduces to help protect teeth and gums. In addition, smart pressure feedback helps you achieve the perfect pressure with three-level instant feedback. After each brushing session, post-brushing feedback on the handle’s display shows where to adjust pressure in the future.

Effortlessly swipe through eight modes—Clean, Deep Clean, White, Gum Health, Sensitive, Max Care, Comfort, and Polish—and three intensities on the interactive color display.

Enjoy a gentle yet effective clean even in hard-to-reach areas with 62,000 bristle movements per minute, powered by Next-Generation Sonicare Technology. Meanwhile, Sonicare Fluid Action supports bristle cleaning between teeth and along the gumline.

The Sonicare app helps you celebrate your progress. Track daily brushing, access your personalized dashboard and receive tips to improve your brushing technique.

Experience up to 14 days of regular brushing on a full charge. The charging base and glass, and a charging travel case ensure your toothbrush stays charged wherever you go.

¹ vs. a manual toothbrush.
² in Clean mode vs. a manual toothbrush in 6 weeks.
Package Dimensions ‏ : ‎ 9.06 x 6.42 x 3.66 inches; 2.59 pounds
Item model number ‏ : ‎ HX9834/91
Date First Available ‏ : ‎ August 31, 2026
Manufacturer ‏ : ‎ Philips
ASIN ‏ : ‎ B0H6GXTTKN
Best Sellers Rank: #40,840 in Health & Household (See Top 100 in Health & Household) #92 in Sonic Toothbrushes
Experience a next-level clean with DiamondClean 9900 Prestige: remove 2000% more plaque¹, enjoy up to 1500% healthier gums², and achieve up to 100% more stain removal in less than two days¹
Brush smarter for complete coverage: smart coverage feedback guides you in real time, glowing blue for completed areas, and provides post-brushing feedback on the display to help retouch missed areas
Achieve perfect pressure: SenseIQ adapts the intensity to your brushing style; smart pressure feedback guides you in real time, glowing green when pressure is optimal to help protect teeth and gums
Tailor your care: customize your brushing session on the interactive display and choose between 8 modes and 3 intensities; connect your toothbrush to the Sonicare app to track your progress
The set includes: 1x Next-Generation DiamondClean 9900 Prestige rechargeable sonic toothbrush, 2x A3 All-in-One brush heads, 1x Prestige charging travel case, 1x Prestige charging base and glass, 1x Wall adapter
This toothbrush is covered by a 2-year limited warranty, and Philips offers a 90-day money-back guarantee if you are not satisfied with the product