Philips Sonicare
Philips Sonicare DiamondClean 9900 Prestige
$399.99
Released 2021
Best Electric Toothbrushes · head-to-head
Philips Sonicare DiamondClean 9900 Prestige vs Colgate hum Smart Electric Toothbrush (Rechargeable)
A sourced, side-by-side comparison. Colgate hum Smart Electric Toothbrush (Rechargeable) is cheaper at $69.99. Every spec and price links to its source.
Colgate
Colgate hum Smart Electric Toothbrush (Rechargeable)
$69.99Cheaper
Released 2020
Which is better: the Philips Sonicare DiamondClean 9900 Prestige or Colgate hum Smart Electric Toothbrush (Rechargeable)?
On the specs we track, they're closely matched. The Colgate hum Smart Electric Toothbrush (Rechargeable) is the cheaper at $69.99.
See Philips Sonicare DiamondClean 9900 Prestige on Amazon See Colgate hum Smart Electric Toothbrush (Rechargeable) on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Philips Sonicare DiamondClean 9900 Prestige | Colgate hum Smart Electric Toothbrush (Rechargeable) |
|---|---|---|
| US price | $399.99 | $69.99 |
| Brand | Philips Sonicare | Colgate |
| Released | 2021 | 2020 |
| Brush action | sonic | sonic |
| Cleaning modes | 5 | 3 |
| Battery days | 14 | 10 |
| Pressure sensor | Yes | No |
| Smart app | Yes | Yes |
| Smart timer | Yes | Yes |
| Travel case | Yes | Yes |
| Release year | 2021 | 2020 |
Sources — Philips Sonicare DiamondClean 9900 Prestige: usa.philips.com (verified 2026-06-15). Colgate hum Smart Electric Toothbrush (Rechargeable): prnewswire.com (verified 2026-06-15).
What's the difference between the Philips Sonicare DiamondClean 9900 Prestige and Colgate hum Smart Electric Toothbrush (Rechargeable)?
Where the two actually differ on the specs we track (3 of 7). Matching specs are omitted.
- Cleaning modes: Philips Sonicare DiamondClean 9900 Prestige 5 vs Colgate hum Smart Electric Toothbrush (Rechargeable) 3
- Battery days: Philips Sonicare DiamondClean 9900 Prestige 14 vs Colgate hum Smart Electric Toothbrush (Rechargeable) 10
- Pressure sensor: Philips Sonicare DiamondClean 9900 Prestige true vs Colgate hum Smart Electric Toothbrush (Rechargeable) false
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
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. (1 sourced review, 1 lab-tested.)
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.
Colgate hum Smart Electric Toothbrush (Rechargeable)
All three sources verified against live pages. Expect a likable app-guided experience but mediocre cleaning: Digital Trends and Engadget both found the guided-brushing app genuinely improves coverage (Engadget's self-test jumped from 49% to 98% coverage), and both liked the lightweight, well-designed body — but Digital Trends called cleaning merely superficial and Reviewed's plaque-reveal dye test left stain the Hum could not remove, with 'poor build quality' and 'short battery life' listed as cons. Rewards praise and affordability each trace to a single source. (3 sourced reviews, 2 lab-tested.)
Praised: Guided-brushing app meaningfully improves coverage and technique; Lightweight, comfortable, well-designed handle; Points-based rewards program is a clever incentive to brush more.
Flagged: Mediocre plaque removal — superficial cleaning, failed Reviewed's plaque dye test; Cheap-feeling components: flimsy power button, unlined travel case; No true in-mouth position sensing — can be fooled by fake brushing motions.