Philips Sonicare 4100 vs Sonicare 5900
The Sonicare 4100 if price matters most: about $50 with a pressure sensor. The 5900 (about $90) adds Philips' 2026 drivetrain, three intensities, a Gum Health mode and up to 21 days per charge, and it’s the better pick for sensitive gums.
Written by Nora Lindqvist. Last checked and updated .
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Decision first
4100 for the budget. 5900 for sensitive gums and fewer charges.
Choose the Sonicare 4100 if
you want a proven, gentle Sonicare with a pressure sensor for about $50.
about $50 on Amazon US, Oct 30, 2026
Choose the Sonicare 5900 if
your gums are tender, you want three intensities and a Gum Health mode, or you want three weeks between charges.
about $90 on Amazon US, Oct 30, 2026
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If you’re shopping for a Sonicare in 2026, this is probably the comparison you’re stuck on. The 4100 is the brush every reviewer knows. The 5900 is the new one with the motor Philips is most excited about in a decade.
| Sonicare 4100 | Sonicare 5900 | |
|---|---|---|
| Cleaning action | Sonic (31,000 movements a minute) | Sonic, Next-Generation drivetrain |
| Brushing modes | 1 | 2 (Clean, Gum Health) |
| Intensity levels | 3 on the 2026 HX4031; older HX3681 varies | 3 |
| Pressure sensor | Yes: the handle pulses | Yes: haptic buzz when you press too hard |
| Timer | SmarTimer, 30-second QuadPacer, EasyStart | SmartTimer, BrushPacer every 20 seconds, head reminder |
| Battery (brand figure) | Up to 14 days | Up to 21 days |
| Charging | Charging stand (USB, no plug) | USB-A charging stand (no plug in the box) |
| Travel case | No | No |
| App | No | No |
| ADA Seal | Yes | Not stated on listing |
| Brush heads | C2 Optimal Plaque Control (click-on) | C3 Two-in-one (click-on) |
| Warranty | 2 years | 2 years |
| Status | Current; refreshed as HX4031 in July 2026 | New generation; on Amazon US since December 2025 |
| Model number (US listing) | HX3681/24 | HX7133/02 |
| On Amazon US since | December 2021 | December 2025 |
| Amazon US check | Sold by Amazon.com (Oct 30, 2026) | Sold by Amazon.com (Oct 30, 2026) |
| Amazon price (Oct 30, 2026) | about $50 | about $90 |
| Est. 3-year cost | $163 | $240 |
| Buy | Price | Price |
What the 5900 adds
- Next-Generation drivetrain. Philips says it delivers steadier power at the bristles, including at the back of the mouth.
- Two modes (Clean and Gum Health) versus one, and a 21-day battery versus 14. The July 2026 version of the 4100 now has three intensities as well, which narrows the gap.
- Longer battery: up to 21 days by Philips’ figure, versus up to 14.
- Two heads in the box on many listings.
What the 4100 keeps
- Half the price, roughly.
- Years of independent testing and owner data. The 5900 has only been on Amazon since December 2025.
Handle Replacement heads
Where the 5000 and 5700 fit
Philips sells near-identical siblings through different stores, so check the model number before assuming two boxes hold the same brush. If you want an app and a charging case on top of the 5900, the step up on Amazon is the 7300.
Will the 4100 be discontinued soon?
No. Philips refreshed it in July 2026 as the HX4031, sold alongside the older HX3681. There’s no reason to avoid it.
Heads and running costs
The 4100 ships with a C2 head (about $10.26 each on Amazon US in October). The 5900 ships with two C3 Two-in-one heads, and C3 refills were the priciest regular Sonicare heads we found, at about $14.98 each. That’s why three years cost about $165 for the 4100 and about $240 for the 5900. You don’t have to keep buying C3 heads, though: any click-on Sonicare head fits the 5900, so switching to C2 refills cuts the gap by about $45.
Pacing: 30 seconds versus 20
The 4100’s QuadPacer buzzes every 30 seconds to move you to the next quarter of your mouth. The 5900’s BrushPacer buzzes every 20 seconds, which splits two minutes into six areas. Six areas suit the way most dentists describe brushing (upper and lower, front, left and right), and it keeps you from lingering on the front teeth.
Pressure feedback
Both warn you with a vibration in the handle, and neither has a light. The 5900’s haptic warning is easier to notice. If you want to see your pressure, the 7300 has a light ring.
Charging and travel
The 4100 charges by USB; the 5900 comes with a USB-A charging stand. Neither includes a wall plug or a case. The 5900’s 21-day rating means a two-week trip without the charger, which the 4100 can only just manage.
Which 4100, and where the 5700 fits
Amazon sells two 4100s side by side: the 2021 HX3681 and the July 2026 HX4031, which adds three intensity levels. If you go the 4100 route, pick the HX4031. Philips’ 5700 sits between these two brushes in the 2026 range. It wasn’t part of our October 30 Amazon check, so we can’t vouch for its US listing; the 5900 is the mid-range Sonicare we’d buy.
Three buyers, three answers
First Sonicare, healthy gums: the 4100. It’s the proven default for about $50.
Tender gums or recession: the 5900, for its lowest intensity, Gum Health mode and 20-second pacer.
Charging annoys you: the 5900. Philips rates it at up to 21 days per charge against the 4100’s 14, which in practice means a two-week holiday without packing the stand and far fewer mornings when a flat battery catches you out.
Buy the 5900 if you’re choosing a Sonicare for years, have sensitive teeth that need a very low setting, or hate charging. Buy the 4100 if you want the cheapest proven Sonicare with a pressure sensor.
My gums bleed when I brush. Should I stop?
No. Bleeding usually means that edge of gum is inflamed and under-cleaned, and it settles once the plaque at the gum line goes. Give it two weeks of gentle, complete brushing. If it is still bleeding after that, book a dentist rather than buying another brush.
What we checkedSonicare’s Gum Health mode and Oral-B’s Sensitive mode both drop the power rather than change the motion, which is why they feel kinder on a sore gum line.
Our pick for thisPhilips Sonicare 4100Price
I already have heads. Will they fit a new handle?
Only inside the same family. Oral-B iO heads fit iO handles and nothing else, classic round heads fit every Oral-B that is not an iO, and any modern click-on Sonicare head fits any modern Sonicare handle.
What we checkedWe mapped every handle on this site to its head family and the price of a genuine pack.
Our pick for thisPhilips Sonicare 5300Price
What people ask us next
It has the newer drivetrain, more settings and longer battery life. The 4100 is cheaper and better proven.
Do they use the same heads?
Both use Sonicare’s click-on heads, so heads are interchangeable.
What does Next-Generation Sonicare mean?
It’s Philips’ name for the re-engineered motor introduced across its 5700 to 7300 models in early 2026.
Can I use C2 heads on the Sonicare 5900?
Yes. All current adult Sonicare heads click on, so the cheaper C2 fits and works fine.
Is the 5900 quieter than the 4100?
Both are quiet. The 5900’s lowest intensity is gentler, which many people read as quieter.
