Feno vs Sonicare vs Oral-B: Which Premium Toothbrush Actually Earns the Price?

A side-by-side look at three brushes people cross-shop at the top of the market — what you get, what you give up, and who each one is really for.

Dana Whitfield · Health and Wellness EditorPublished July 20, 2026

A person using the Feno smartbrush at the bathroom mirror as part of a morning routine

If you are spending real money on a toothbrush, you are probably choosing between these three. Two are the best of the traditional premium electrics; one is a newer U-shaped design that works in a completely different way. I have used all three, so rather than bury the details in prose, here is the honest side-by-side first, then a short profile of each.

How they compare, side by side
Spec	Feno SmartbrushWinner	Sonicare DiamondClean	Oral-B iO Series 9
Format	U-shaped mouthpiece you bite down on	Sonic brush head you guide	Oscillating round head you guide
Cleaning time	About 20 seconds	2 minutes	2 minutes
Bristles	~18,000 (brand claim)	~3,000 (typical sonic head)	~2,500 (typical round head)
Coverage	Cleans all teeth at once; shape does the aiming	You guide it, tooth by tooth	You guide it, tooth by tooth
Price	$299 (Founder's kit)	Roughly $200–$280	Roughly $200–$300
Best for	Rushed mornings and gumline coverage	Coaching and gentle-pressure feedback	Round-head plaque-removal fans

Our winner

9.2 / 10

Feno

Feno Smartbrush

Feno is the outlier here, and that is the point. Instead of a brush head you steer, a soft U-shaped mouthpiece cradles every tooth at once; you add foam, bite down, and a roughly 20-second cycle does the work. Feno says it uses around 18,000 bristles and reaches up to 99 percent of your tooth surfaces, and in use the coverage really is built into the shape rather than your technique.

The trade is price and a few days of getting used to a bigger mouthpiece. What you get back is speed and consistency — and, in my case and in a striking number of verified reviews, a notably easier dental cleaning. It is not a perfectly polished gadget yet, but for the actual clean it was the best of the three.

We like

Fastest, most hands-off clean of the three
Reaches the gumline you usually rush past
App sizes the mouthpiece and times the cycle

We don't like

Highest upfront price
A short adjustment period, and it is a first-generation device

GET THE FOUNDER'S EDITION BUNDLE

The final verdict

All three are worth their money for the right person, but they are not doing the same job. If you want coaching and a familiar routine, the Sonicare and Oral-B are excellent. If you want the fastest, most thorough, most hands-off clean, Feno is the one that earns its price, and it is the brush I kept using once the testing was over.