£399.99

Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Cleaning Modes and 3 Intensity Levels, White, Model HX9917/88

White, HX9917/88

Price data last checked 131 day(s) ago - refreshing...

View at Amazon

We'll watch every seller, every day. One email when your price arrives.

This is the most expensive it has ever been. Walk away.

£400 today · previous high £400 · all-time low £188

NEW HERE?

Amazon shows you one price. We show you all of them.

Tosheroon watches Amazon prices so you don't have to. Every product on Amazon has a price history — we make it visible. Set the price you'd actually pay, and we'll email you the second it gets there. No app, no account, one email.

WHAT'S ON THIS PAGE

↓ Price chart
when this has been cheap or pricey
↓ Forecast
where the price is heading next
↓ Statistics
all-time high & low, recent range
↑ Price alert
name your number, we'll email you

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 153 days • 153 data points (No recent data available)

Historical
Generating forecast...
£399.99 £166.79 £217.67 £268.55 £319.43 £370.31 £421.19 01 September 2025 09 October 2025 16 November 2025 24 December 2025 31 January 2026

Price Distribution

Price distribution over 153 days • 4 price ranges

Days at Price
Current Price
111 days 27 days 4 days 11 days · current 0 28 56 83 111 £188-230 £230-273 £315-358 £358-400 Days at Price

Price Analysis

Most common range: £188-230 (111 days, 72.5%)

Price range: £188 - £400

Price levels: 4 price ranges over 153 days

Description

The Philips Sonicare DiamondClean Smart 9400 electric toothbrush provides complete and efficient oral care, removes up to 20 times more plaque than a manual toothbrush and provides up to 15 times healthier gums². Safe to use with braces, fillings, crowns and veneers. There are 4 cleaning modes: Clean mode for daily cleaning, White+ mode for removing discolouration, Gum Health mode for gentle but effective cleaning of the gums and Deep Clean+ mode for a refreshing, thorough clean. There are 3 intensity levels available. Plus, the integrated Philips Sonicare ProtectiveClean pressure sensor with light ring shows you when you press too hard. Advanced sonic technology provides gentle yet effective cleaning by flushing liquid into the interdental spaces and along the gum line and providing a cleaning performance of 62,000 bristle movements per minute. The innovative BrushSync technology informs you when it's time to change the brush head. Improve your brushing technique with the 4-quadrant timer. In addition, you can reach the recommended cleaning time of 2 minutes with the 2-minute timer. The Philips Sonicare DiamondClean Smart 9400 is perfect as a toothbrush on the go, thanks to the high-quality travel case with integrated USB. You can also charge the battery at home with the iconic charging glass. With regular use, the battery lasts up to two weeks on a single charge (based on two cleaning cycles of two minutes per day in standard mode). ¹ compared to a manual toothbrush ² in clean mode compared to a manual toothbrush ³ based on one between 2022 and 2023 of over 2,600 dentists (dentists and dental hygienists) in the USA, Canada, Japan, China, Korea, Thailand, Germany, UK, Switzerland, France, Belgium, Austria, Italy. Spain, Spain, Spain Study carried out after 3 days in White+ mode with a leading toothpaste for teeth whitening compared to a manual toothbrush Safety Warning Do not use when sleeping or showering. Keep out of reach of children.

Key Features

Advanced sonic toothbrush for improved oral health: with the same brushing behaviour, it is up to 20 times more effective¹ and ensures up to 15 times healthier gums²

Personalize your toothbrushing experience with this innovative adult electric toothbrush: choose from 4 brushing modes and 3 intensity levels to achieve your oral hygiene goals

REAL TIME REAL TIME RESULTING The light ring at the end of the handpiece will flash when you apply too much pressure. So you can reduce pressure and protect your teeth and gums

Personalised instructions: connect your toothbrush to the Philips Sonicare app and receive personalised cleaning instructions to maintain and improve your brushing habits

The most recommended sonic toothbrush brand worldwide³: Benefit from Philips expertise to optimally care for teeth and gums

The set contains: 1 x DiamondClean Smart 9400 electric sonic toothbrush, 1 x A3 premium all-in-one brush head, 1 x G3 premium gum care brush head, 1 x charging glass, 1 x USB travel charging case

Product Specifications

Brand
Philips
Colour
White
Size
1 Count (pack Of 1)
Format
Personal Care
Domain
Amazon UK
Listed Since
22 July 2021

Barcode

No barcode data available

Similar Products You Might Like

Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Cleaning Modes and 3 Intensity Levels, Black, Model HX9917/89
98% match

Philips Sonicare DiamondClean Smart 9400 Electric Toothbrush, Sonic Toothbrush with App, Pressure Sensor, Brush Head Detection, 4 Cleaning Modes and 3 Intensity Levels, Black, Model HX9917/89

Philips

£399.99 31 Jan 2026
Philips Sonicare 3100 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 3 Intensity Levels, EasyStart Feature, SmarTimer, 14-Day Runtime, Travel Case, White, HX4034/21, [New]
98% match

Philips Sonicare 3100 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 3 Intensity Levels, EasyStart Feature, SmarTimer, 14-Day Runtime, Travel Case, White, HX4034/21, [New]

Philips

£94.99 02 Apr 2026
Philips Sonicare 4000 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, Black, HX4044/52, [New]
98% match

Philips Sonicare 4000 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, Black, HX4044/52, [New]

Philips

£104.99 18 Feb 2026
Philips Sonicare 4100 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, Forest Green, HX4042/46, [New]
98% match

Philips Sonicare 4100 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, Forest Green, HX4042/46, [New]

Philips

£101.00 12 Apr 2026
Philips Sonicare 4000 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, White, HX4044/41, [New]
98% match

Philips Sonicare 4000 Series Electric Toothbrush - Sonic Toothbrush with Pressure Sensor, 4 Brushing Settings, EasyStart, SmarTimer, 21-Day Runtime, Travel Case, White, HX4044/41, [New]

Philips

£104.99 08 Mar 2026
Philips Sonicare DiamondClean Series 9000 Twin Pack Sonic Electric Toothbrushes, Cleaner Teeth and Gums Connected with App, Black and Rose Gold (Model HX9914/61)
98% match

Philips Sonicare DiamondClean Series 9000 Twin Pack Sonic Electric Toothbrushes, Cleaner Teeth and Gums Connected with App, Black and Rose Gold (Model HX9914/61)

Philips

£263.37 31 Jan 2026
Philips Sonicare 2000 Series Electric Toothbrush - Sonic Toothbrush with 2 Intensity Levels, EasyStart Feature, SmarTimer, 14-Day Runtime, White, Model HX4021/01, [New]
98% match

Philips Sonicare 2000 Series Electric Toothbrush - Sonic Toothbrush with 2 Intensity Levels, EasyStart Feature, SmarTimer, 14-Day Runtime, White, Model HX4021/01, [New]

Philips

£59.99 22 Mar 2026
Rotating Electric Toothbrush for Adults with 8 Brush Heads, Sensitive Gum Care Electric Toothbrush with 3 Modes and 2 Min Smart Timer, Rechargeable Last 60 Days
98% match

Rotating Electric Toothbrush for Adults with 8 Brush Heads, Sensitive Gum Care Electric Toothbrush with 3 Modes and 2 Min Smart Timer, Rechargeable Last 60 Days

TEETHEORY

Out of Stock 07 Feb 2026
Philips Sonicare ProtectiveClean 4300 Electric Toothbrush, Sonic Toothbrush with Two Intensity Levels, Pressure Sensor and Timer, White, Model HX6807/51
98% match

Philips Sonicare ProtectiveClean 4300 Electric Toothbrush, Sonic Toothbrush with Two Intensity Levels, Pressure Sensor and Timer, White, Model HX6807/51

Philips

£65.00 13 Jan 2026
Sonic Electric Toothbrush, Rechargeable Power Toothbrush with 6 Duponts Brush Heads, with 2 Minute Smart Timer, 5 Modes with Teeth Whitening, Gift for Family
98% match

Sonic Electric Toothbrush, Rechargeable Power Toothbrush with 6 Duponts Brush Heads, with 2 Minute Smart Timer, 5 Modes with Teeth Whitening, Gift for Family

Y-Kelin

£9.99 28 Jan 2026
Philips Sonicare 5300 HX7101/04 Toothbrush - 2 Modes, Pressure Alert
98% match

Philips Sonicare 5300 HX7101/04 Toothbrush - 2 Modes, Pressure Alert

Philips

£69.99 16 Feb 2026
Philips Sonicare DiamondClean 9900 Prestige Electric Toothbrush, with SenseIQ Technology and App, 5 Brushing Modes, 3 Intensity Levels, Charging Travel Case, Black, Model HX9992/43
98% match

Philips Sonicare DiamondClean 9900 Prestige Electric Toothbrush, with SenseIQ Technology and App, 5 Brushing Modes, 3 Intensity Levels, Charging Travel Case, Black, Model HX9992/43

Philips

£280.43 18 Mar 2026
Philips Sonicare DiamondClean 9000 Electric Toothbrush, Special Edition, Sonic Toothbrush with App, Pressure Sensor, 4 Brushing Modes, 3 Intensity Levels, Charging Stand, Pink, Model HX9911/79
98% match

Philips Sonicare DiamondClean 9000 Electric Toothbrush, Special Edition, Sonic Toothbrush with App, Pressure Sensor, 4 Brushing Modes, 3 Intensity Levels, Charging Stand, Pink, Model HX9911/79

Philips

£149.99 05 Feb 2026
Philips Sonicare DiamondClean 9000 Electric Toothbrush HX9911/27 - Sonic Toothbrush with 4 Cleaning Programs, 3 Intensities, Pressure Control, Charging Glass and USB Travel Charging Case, White
98% match

Philips Sonicare DiamondClean 9000 Electric Toothbrush HX9911/27 - Sonic Toothbrush with 4 Cleaning Programs, 3 Intensities, Pressure Control, Charging Glass and USB Travel Charging Case, White

Philips Sonicare

£169.95 01 Feb 2026
Oclean X10, Smart Sonic Electric Toothbrush, 5 Brushing Modes, 3h-Quick Charge for 60 Days, 2 Min Timer & Pressure Sensor, IPX7 Ultrasonic Travel Toothbrush – Pink
98% match

Oclean X10, Smart Sonic Electric Toothbrush, 5 Brushing Modes, 3h-Quick Charge for 60 Days, 2 Min Timer & Pressure Sensor, IPX7 Ultrasonic Travel Toothbrush – Pink

Oclean

£71.99 07 Feb 2026
Philips Sonicare 6100 Series Electric Toothbrush - Next-Generation Technology, Pressure Sensor, 6 Brushing Settings, SmarTimer, BrushPacer, 21-Day Runtime, Travel Case, Black, Model HX7401/12
98% match

Philips Sonicare 6100 Series Electric Toothbrush - Next-Generation Technology, Pressure Sensor, 6 Brushing Settings, SmarTimer, BrushPacer, 21-Day Runtime, Travel Case, Black, Model HX7401/12

Philips

£249.99 02 Apr 2026
Rotating Electric Toothbrush Case for Adults, 4 Modes Deep Clean Electric Toothbrush with 8 Brush Heads (2 Types), 25-Days Rechargeable Power and 2 Min Smart Timer
98% match

Rotating Electric Toothbrush Case for Adults, 4 Modes Deep Clean Electric Toothbrush with 8 Brush Heads (2 Types), 25-Days Rechargeable Power and 2 Min Smart Timer

TEETHEORY

£20.99 13 Feb 2026
Philips Sonicare 7100 Series Electric Toothbrush - Next-Generation Sonicare Technology, Pressure Sensor, 12 Brushing Settings, 21-Day Runtime, Charging Travel Case, White & Black, 2 Pack, HX7429/04
98% match

Philips Sonicare 7100 Series Electric Toothbrush - Next-Generation Sonicare Technology, Pressure Sensor, 12 Brushing Settings, 21-Day Runtime, Charging Travel Case, White & Black, 2 Pack, HX7429/04

Philips

£199.99 17 Apr 2026
Philips Sonicare 5300 Electric Toothbrush, Sonic Toothbrush with 2 Intensity Levels, Pressure Alert, EasyStart, SmarTimer and BrushPacer, White, Model HX7108/04 [New Technology]
98% match

Philips Sonicare 5300 Electric Toothbrush, Sonic Toothbrush with 2 Intensity Levels, Pressure Alert, EasyStart, SmarTimer and BrushPacer, White, Model HX7108/04 [New Technology]

Philips

£69.99 25 Jan 2026
2 Pack Sonic Electric Toothbrush for Adults and Kids - Sonic Toothbrush with 10 Toothbrush Heads (2 Types), 90 Days Battery Life, 50,000 VPM, 5 Cleaning Modes, Travel Case, 2 Minute Timer
98% match

2 Pack Sonic Electric Toothbrush for Adults and Kids - Sonic Toothbrush with 10 Toothbrush Heads (2 Types), 90 Days Battery Life, 50,000 VPM, 5 Cleaning Modes, Travel Case, 2 Minute Timer

YTEATH PRO

£35.90 06 Feb 2026
Philips Sonicare 6100 Series Electric Toothbrush - Next-Generation Sonicare Technology, Pressure Sensor, 6 Brushing Settings, SmarTimer, BrushPacer, 21-Day Runtime, Travel Case, Navy Blue, HX7403/07
98% match

Philips Sonicare 6100 Series Electric Toothbrush - Next-Generation Sonicare Technology, Pressure Sensor, 6 Brushing Settings, SmarTimer, BrushPacer, 21-Day Runtime, Travel Case, Navy Blue, HX7403/07

Philips

£289.99 19 Apr 2026
OasiSmile Sonic Electric Toothbrush - 42000 VPM Powerful Deep Clean, Rechargeable Toothbrush with 6 Brush Heads, 120 Days Long Battery, IPX7 Waterproof with 2-Min Timer, Perfect for Home & Travel
98% match

OasiSmile Sonic Electric Toothbrush - 42000 VPM Powerful Deep Clean, Rechargeable Toothbrush with 6 Brush Heads, 120 Days Long Battery, IPX7 Waterproof with 2-Min Timer, Perfect for Home & Travel

OasiSmile

Out of Stock 10 Feb 2026
Oclean X Pro Elite Premium Set (Toothbrush+6 Brush Heads+Travel Case), Smart Mute Sonic Electric Toothbrush, 4 Whitening Modes, Quick Charge for 35 Days, IPX7 – Grey
98% match

Oclean X Pro Elite Premium Set (Toothbrush+6 Brush Heads+Travel Case), Smart Mute Sonic Electric Toothbrush, 4 Whitening Modes, Quick Charge for 35 Days, IPX7 – Grey

Oclean

£82.48 07 Feb 2026
Coulax Pro Sonic Electric Toothbrush - 5 Modes, 8 Heads, 2 Min Timer
98% match

Coulax Pro Sonic Electric Toothbrush - 5 Modes, 8 Heads, 2 Min Timer

Coulax Pro

£16.98 28 Jan 2026