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Oral-B iO Series 5 vs Oral-B iO Series 9 vs Philips Sonicare ProtectiveClean 4100
Too close to call: the right one depends on your home.
The verdict in 10 seconds
The Oral-B iO Series 5 suits you if
- You have sensitive gums and want a softer, gentler feel
- You tend to brush too hard and want a warning light
- You want smart coaching without paying for the top-tier model
May not suit you if
- You want cheap replacement heads
- You travel often and hate frequent or slow charging
- You have a small or crowded mouth and prefer a compact head
The Oral-B iO Series 9 suits you if
- You care about cleaning performance above everything else
- You tend to brush too hard and want clear feedback on pressure
- You enjoy app tracking and a stylish gadget on the bathroom counter
May not suit you if
- You want a brush that lasts weeks between charges
- You'd rather not pay premium prices for brush heads
- You want the smart tracking to be precise, or you have a very small mouth
The Philips Sonicare ProtectiveClean 4100 suits you if
- You're new to electric toothbrushes and want something simple to start with
- You have sensitive gums and want a brush that eases you in gently
- You want strong cleaning and the essential features without paying for extras
May not suit you if
- You travel often and want a case and a compact charger
- You want cheap replacement heads over the long run
- Long-term durability matters more to you than upfront price
The short version
These are closely matched, so pick by what your home needs. The Oral-B iO Series 5 suits you if you have sensitive gums and want a softer, gentler feel. The Oral-B iO Series 9 suits you if you care about cleaning performance above everything else. The Philips Sonicare ProtectiveClean 4100 suits you if you're new to electric toothbrushes and want something simple to start with.
We researched 15 expert reviews, analyzed 70,302 owner ratings and comments across 15 sources for the three, and cross-checked them into one verdict, so you don't have to.
See the evidence
The scoreboardProduct Review score 81 vs 70 vs 81 · reliability 75 vs 32 vs 60
| Oral-B iO Series 5 | Oral-B iO Series 9 | Philips Sonicare ProtectiveClean 4100 | |
|---|---|---|---|
| Product Review score | 81 | 70 | 81 |
| Experts | 87 | 88 | 89 |
| Owners | 77 | 71 | 84 |
| Reliability | 75 | 32 | 60 |
| Report problems | 10% | 27% | 16% |
| Evidence | 3 reviews · 489 comments | 8 reviews · 175 comments | 4 reviews · 143 comments |
| Typical price | $96–$120 | $200–$300 | $40–$50 |
● marks the better number on each row.
Experts vs ownersExperts 87 vs 88 vs 89 · Owners 77 vs 71 vs 84
Oral-B iO Series 5
Oral-B iO Series 9
Philips Sonicare ProtectiveClean 4100
How we reached each verdictThe numbers behind each model's score
Oral-B iO Series 5
Across 3 hands-on expert reviews (2 with published scores) and 489 owner comments, cleaning performance is the clear strength: all 3 reviewers praise it, as do 49% of owners, and 14% of owners specifically call it gentle. The recurring drawbacks are cost and battery: all 3 reviewers note the high price or expensive iO-only heads (about $12 each versus roughly $5 for standard Oral-B heads), and all 3 flag slow charging (about 12 to 16 hours) or modest battery life of about two weeks or a little more, echoed by 6% of owners. Reliability looks reasonable, with failures mentioned in 10% of comments and 3% of owners saying their brush broke or died. Retail ratings are strong at 4.4 stars on Amazon (417 votes) and 77% five-star across about 5,600 ratings, but the expert pool is small, so confidence is medium.
Oral-B iO Series 9
Experts rate the iO Series 9 highly (score 88), and all 8 hands-on reviewers praise its cleaning. Owners are cooler (score 71), and reliability is the weak spot at 32: 27% of owner comments mention failures, 16% say the brush broke or died, and 24% of retail ratings are 1-star. Battery life is the biggest split. Experts reported anywhere from about 10 days to 38.5 days, and 20% of owners complain about the battery while only 3% praise it. The evidence is solid on cleaning, based on 175 owner comments (151 first-hand) and 9,395 retail votes, but less settled on long-term durability.
Philips Sonicare ProtectiveClean 4100
Of the 4 expert sources, 3 tested it hands-on and all 3 praised its cleaning. The fourth, Consumer Reports, showed no visible conclusions. Owners agree: 48% of 143 comments praise cleaning and 18% praise value, and it holds 4.6 stars across about 55,500 Amazon ratings. Reliability is the weak spot, scoring 60: 16% of comments mention failures, 10% say the brush broke or died, and 4% report charger problems. Battery evidence is mixed, ranging from about 2 weeks on high intensity to 49.5 days measured by one tester, and expert coverage is thin with only 2 published scores, so confidence is medium.
Where each one falls shortThe most common complaints
Oral-B iO Series 5
- Very slow charging, about 12 to 16 hours
- Battery life of about two weeks, shorter than many rivals
- Pricey iO-only replacement heads
Oral-B iO Series 9
- Very high price, plus pricey iO-only brush heads
- Battery life can be short, and some units fail
- App tooth tracking is inaccurate, and residue builds up in the head
Philips Sonicare ProtectiveClean 4100
- Some units break, die, or have charger problems
- Slow charging (up to 24 hours) and no travel case
- Replacement heads are expensive, and there's no light showing the current intensity
Quick answers
Which is better, the Oral-B iO Series 5 or the Oral-B iO Series 9 or the Philips Sonicare ProtectiveClean 4100?
Neither, clearly. They're closely matched, so choose by your floors, pets and budget.
Based on: Product Review score 81 vs 70 vs 81.Which is more reliable?
The Oral-B iO Series 5. It's the least likely of the three to give you trouble.
Based on: Reliability 75 vs 32 vs 60; problems mentioned by 10% vs 27% vs 16% of owners.Which is easier to live with day to day?
The Philips Sonicare ProtectiveClean 4100. It's the one people are happiest with once it's home.
Based on: Owners score 77 vs 71 vs 84, from ratings and comments.Which is cheaper?
The Philips Sonicare ProtectiveClean 4100 usually costs less.
Based on: Typical prices: Oral-B iO Series 5 $96–$120; Oral-B iO Series 9 $200–$300; Philips Sonicare ProtectiveClean 4100 $40–$50.As an Amazon Associate we earn from qualifying purchases. It never changes a score.