# Philips Sonicare DiamondClean 9900 Prestige: specs and price

**Price (US):** $399.99 at usa.philips.com (MSRP; frequently sold ~$329 at retail), as of 2026-06-27. A sourced, dated price of record — other retailers (incl. Amazon) may be lower. Among the 20 electric toothbrushes we track it is the most expensive; category median $110.
**Brand:** Philips Sonicare
**Released:** 2021
**Deskmark:** Bronze Deskmark — pay-blind category standing 4/100, #13 of 19 in class (independent, computed from sourced data, never for sale).
**Price tracked since:** June 2026

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $399.99 |
| Brand | Philips Sonicare |
| Released | 2021 |
| Brush action | sonic |
| Cleaning modes | 5 |
| Battery days | 14 |
| Pressure sensor | Yes |
| Smart app | Yes |
| Smart timer | Yes |
| Travel case | Yes |

## Where it stands

At $400, the Philips Sonicare DiamondClean 9900 Prestige is the most expensive of the 20 electric toothbrushes we track, where the median is $95. On the spec sheet, its cleaning modes of 5 is above the median of the 22, its release year of 2021 is below the median of the 16, and its battery days of 14 is at the median of the 19.

## What reviewers say

Only one whitelisted tester, TechRadar, published a hands-on review of this exact model. TechRadar calls it a premium, remarkably quiet 'executive' brush with helpful real-time feedback, but flags that every setting lives in the app and that its pressure sensor and location tracking trail the Oral-B iO Series 9. (Based on 1 review, 1 lab-tested, 2021-07-07.)

Praised: Remarkably quiet, premium 'executive' design that feels smooth and comfortable in the hand; Real-time feedback that warns on scrubbing and auto-lowers intensity when you press too hard; USB-C rechargeable leather-effect travel case, practical for frequent travellers.
Flagged: No handle controls beyond a power button — all mode/intensity changes require the app; Pressure sensor and in-app location tracking trail the Oral-B iO Series 9; Expensive at $399.99 launch price.
Disagreement: Only one whitelisted source survived verification, so no cross-source comparison is possible. TechRadar's own verdict is internally mixed: it praises the premium feel and adaptive feedback while noting app-dependence and the high price as real drawbacks.
Sources: TechRadar (2021-07-07, techradar.com)

## Frequently asked questions

**What do reviewers say about the Philips Sonicare DiamondClean 9900 Prestige?**

Only one whitelisted tester, TechRadar, published a hands-on review of this exact model. TechRadar calls it a premium, remarkably quiet 'executive' brush with helpful real-time feedback, but flags that every setting lives in the app and that its pressure sensor and location tracking trail the Oral-B iO Series 9. Praised: Remarkably quiet, premium 'executive' design that feels smooth and comfortable in the hand; Real-time feedback that warns on scrubbing and auto-lowers intensity when you press too hard; USB-C rechargeable leather-effect travel case, practical for frequent travellers. Flagged: No handle controls beyond a power button — all mode/intensity changes require the app; Pressure sensor and in-app location tracking trail the Oral-B iO Series 9; Expensive at $399.99 launch price. (From 1 tester review, 1 lab-tested.)

**How much does the Philips Sonicare DiamondClean 9900 Prestige cost?**

The Philips Sonicare DiamondClean 9900 Prestige has a US price of $399.99 (MSRP; frequently sold ~$329 at retail), as of 2026-06-15.

**How does the Philips Sonicare DiamondClean 9900 Prestige compare on price?**

At $400, the Philips Sonicare DiamondClean 9900 Prestige is the most expensive of the 20 electric toothbrushes we track, where the median is $95.

**When was the Philips Sonicare DiamondClean 9900 Prestige released?**

The Philips Sonicare DiamondClean 9900 Prestige was released 2021.

**What are the Philips Sonicare DiamondClean 9900 Prestige's key specs?**

Philips Sonicare DiamondClean 9900 Prestige (Philips Sonicare): brush action sonic, cleaning modes 5, battery days 14, pressure sensor Yes, smart app Yes. Full sourced spec sheet verified 2026-06-15.

Source: https://www.usa.philips.com/c-p/HX9990_13/sonicare-9900-prestige-power-toothbrush-with-senseiq (usa.philips.com, accessed 2026-06-15)
Corroboration: https://www.usa.philips.com/a-w/about/news/archive/standard/news/press/2021/20210111-sonic-power-meets-intelligent-care-with-the-new-philips-sonicare-9900-prestige.html (accessed 2026-06-15)
Canonical: https://frontdeskreview.com/product/electric-toothbrushes/philips-sonicare-diamondclean-9900-prestige/
Cite: Per The Front Desk Review, the Philips Sonicare DiamondClean 9900 Prestige price of record was $399.99 as of 2026-06-15 — https://frontdeskreview.com/product/electric-toothbrushes/philips-sonicare-diamondclean-9900-prestige/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl