Does Brushing Longer Clean Your Teeth Better?

Can Faster Brushing Still Clean Well?

Two minutes.

You've probably heard that number your entire life.

And there's a good reason for it.

For conventional toothbrushes, brushing longer generally removes more plaque.

A 2025 systematic review and meta-analysis comparing one-minute and two-minute brushing found significantly greater plaque reduction after two minutes for both manual and powered toothbrushes.

So why would any toothbrush claim to finish in 20 seconds?

To understand that, you first have to separate two things:

Time and how the brush uses that time.

Two minutes makes sense when you clean sequentially

A traditional toothbrush cleans a relatively small area.

Front teeth.

Then the side.

Then the back.

Then another quadrant.

You only have one brush head, so it has to travel.

Two minutes gives you more opportunity to reach more surfaces.

Research has also found longer brushing can increase toothpaste delivery and fluoride retention when conventional fluoride dentifrice is used.

For a conventional toothbrush, rushing the process isn't a good strategy.

But simultaneous cleaning changes the math

Imagine washing 28 windows.

If you have one cloth, cleaning takes time because you move from window to window.

If 28 cleaning surfaces worked at once, the relationship between time and coverage would change.

That's the design idea behind full-mouth brushing.

Feno's TrueFit Mouthpiece places approximately 18,000 bristles around the dental arch and is designed to clean accessible tooth surfaces simultaneously. Its programmed cycle runs for 20 seconds and delivers 250 strokes per cycle, according to Feno's current product specifications.

That's fundamentally different from moving a two-inch toothbrush around the mouth.

But 20 seconds shouldn't become a universal rule

This distinction matters.

Independent research showing that conventional brushing works better for two minutes does not prove that every automatic mouthpiece can clean effectively in less time.

In fact, studies of some other U- and Y-shaped automatic brushes have found poorer plaque removal than conventional two-minute brushing.

Those devices weren't Feno.

But the research tells us something important:

Speed only becomes useful if the device is actually creating adequate contact and coverage during that shorter period.

A faster cycle on its own means nothing.

The better question isn't “How fast?”

It's:

“What is happening during those seconds?”

How many surfaces are being contacted?

How are the bristles positioned?

Does the mouthpiece fit?

Is the user moving it correctly?

That's why comparing 20 seconds of simultaneous full-mouth brushing to 20 seconds with a traditional toothbrush isn't an apples-to-apples comparison.

The mechanisms are different.

Efficiency doesn't mean simply doing the same job faster.

It means changing how the job gets done.

See what happens inside Feno's 20-second cycle