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Oral-B iO Series 6 Rechargeable Electric Toothbrush vs AquaSonic Black Series Ultra Whitening Toothbrush
Which one has the downsides you can live with?
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The short answer
Oral-B iO Series 6 Rechargeable Electric Toothbrush ranks higher (#1 vs #4 of 10) and scores better on cleaning feel, gentleness, ease of use, durability. AquaSonic Black Series Ultra Whitening Toothbrush wins on battery, replacement head cost.
The biggest complaint about the Oral-B iO Series 6 Rechargeable Electric Toothbrush is costs much more, with io-only heads; for the AquaSonic Black Series Ultra Whitening Toothbrush it's intense vibration, not very gentle. Pick the one whose catch bothers you less.
Good for: A visible pressure light that also flags too little pressure
Its catch: costs much more, with iO-only heads
Check price on AmazonGood for: Tight budgets (8 heads in the box)
Its catch: intense vibration, not very gentle
Check price on AmazonPaid links. We don't list prices — they change daily. Neither one feels right?
Side by side
| Oral-B iO Series 6 Rechargeable Electric Toothbrush | AquaSonic Black Series Ultra Whitening Toothbrush | |
|---|---|---|
| Rank in electric toothbrushes | #1 | #4 |
| Price tier | $$ | $ |
| Type | Oscillating | Sonic |
| Amazon 1–2★ share | 8% | 6% |
| Overall score | 3.9 | 3.7 |
| Cleaning feel | 4.5 | 4.0 |
| Gentleness | 4.5 | 2.0 |
| Battery | 4.0 | 5.0 |
| Replacement head cost | 2.5 | 4.5 |
| Ease of use | 4.5 | 4.0 |
| Durability | 3.5 | 2.5 |
Price tiers: $ under $50 · $$ $50–120 · $$$ over $120. Highlighted = clearly better (a score gap of 0.3 or more, or a 1–2★ share at least 3 points lower). Scores are explained, with sources, on each product's page.
Top complaints
Oral-B iO Series 6 Rechargeable Electric Toothbrush
- Costs much more, with iO-only heads
Wirecutter says it regularly costs three times as much as the Pro 1000 and its heads cost more than double; standard Oral-B heads don't fit iO models. Electric Teeth lists the iO-specific heads and the non-essential Bluetooth as its cons.
- Gunk builds up at the head mount
Wirecutter notes some customer reviewers clean the junction between head and handle daily, and Electric Teeth says the attachment point can collect mold if not cleaned regularly.
- Drooly brushing for some, slow charging
The size and shape of iO heads gave some Wirecutter testers a more drooly experience than the Pro 1000. Electric Teeth says a full charge takes up to about 12 hours.
AquaSonic Black Series Ultra Whitening Toothbrush
- Intense vibration, not very gentle
Electric Teeth found it less gentle than Sonicare or Oral-B, said even the soft mode didn't feel very soft, and described the bristles as stiff. Amazon's summary calls the vibration level mixed and pretty intense. Some 1-star Walmart reviews say the vibration was hard to tolerate.
- No pressure sensor
CNN Underscored says the missing pressure sensor is the main reason it didn't earn a top spot. Electric Teeth also lists it as a con.
Source: CNN Underscored, Electric Teeth - Cheaper build; some die around 6 months
Electric Teeth says it feels cheaper than premium rivals (the chrome rings are plastic) and notes some reports of breakage; the warranty is 1 year. Amazon's summary says durability is mixed, with some owners saying it stopped working after 6 months. Walmart low-star reviews mention dead chargers and heads that don't stay on.
- Small heads
CNN Underscored notes the included heads are on the smaller side, and a Walmart 1-star reviewer compared the head to a toddler's.
Who should pick which
Pick the Oral-B iO Series 6 Rechargeable Electric Toothbrush if
A visible pressure light that also flags too little pressure
A quieter Oral-B
Timer and battery display without needing the app
Skip it if: You want the cheapest heads; You don't want to clean the head mount often; You only need the basics (the Pro 1000 covers them)
Pick the AquaSonic Black Series Ultra Whitening Toothbrush if
Tight budgets (8 heads in the box)
Travel (case plus a long battery)
People who like a strong buzz
Skip it if: You have sensitive gums or teeth; You tend to brush too hard and want a pressure sensor; You want premium build quality
We don't list prices — they change daily. Paid links.
Neither one feels right?
If both catches are deal-breakers, start here.
Wirecutter's long-running top pick, with cheap, widely available heads. It is louder than sonic brushes, and its pressure alert is easy to miss. Owners also report units that stop holding a charge.
Its catch: stops holding a charge or dies earlyA third option · #6Oral-B iO Series 3 Rechargeable Electric ToothbrushThe cheapest way into Oral-B's quieter, gentler iO motor, with a visible pressure light. It locks you into pricier iO-only heads, and it has the highest share of 1-star Amazon ratings among the big-brand picks here.
Its catch: stops working after about 6 monthsAll 10 comparedSee every electric toothbrush, rankedEach one's biggest complaint at a glance, with the full ranking.
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- Oral-B iO Series 9 Rechargeable Electric Toothbrush vs AquaSonic Black Series Ultra Whitening Toothbrush
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