By Susan Volk, RDH — Last updated August 20, 2026
Short answer: Most people who brush twice a day still miss a surprising amount of plaque — not because they’re not trying, but because of a handful of habits that feel thorough but aren’t: brushing too fast, using too much pressure, missing the gumline, and skipping the tongue and the inside surfaces of the back teeth. Technique matters more than how expensive your toothbrush is.
Mistake 1: Not Brushing Long Enough
Two minutes is the standard recommendation, and most people underestimate how long that actually feels — studies on this have consistently found the average person brushes closer to 45 seconds. That’s not nearly enough time to clean all the surfaces of every tooth. An electric toothbrush with a built-in timer, or just a phone timer, closes this gap more reliably than counting in your head.
Mistake 2: Pressing Too Hard
More pressure doesn’t mean cleaner teeth — plaque is soft and comes off with light, consistent brushing. Heavy pressure instead wears down enamel over time and can push gums back, exposing root surfaces and causing sensitivity. If your toothbrush bristles are visibly splaying outward within a few weeks of use, that’s a sign you’re brushing too hard.
Mistake 3: Missing the Gumline
Plaque builds up fastest right at the gumline, but a lot of brushing technique focuses on the flat chewing surfaces and misses this area. Angle the bristles at about 45 degrees toward the gumline so they can reach just slightly beneath it, and use small, gentle circular motions rather than long back-and-forth strokes.
Mistake 4: Skipping the Inside Surfaces
The outside surfaces of your teeth (the ones you see in the mirror) are the easiest to reach and the ones people brush most thoroughly. The inside surfaces — especially of your back molars and lower front teeth — get rushed or skipped entirely because they’re harder to see and reach. This is one of the most common spots for plaque and tartar buildup at a cleaning.
Mistake 5: Ignoring the Tongue
Bacteria collect on the surface of your tongue, particularly toward the back, and contribute to bad breath and can recolonize your teeth after brushing. A few gentle passes with your toothbrush or a dedicated tongue scraper makes a real difference.
A Simple Routine That Covers Everything
Break your mouth into sections — upper right, upper front, upper left, lower right, lower front, lower left — and spend about 20 seconds on each, brushing both the outer and inner surfaces before moving on. That alone gets you to two minutes and makes sure nothing gets rushed or skipped.
Frequently Asked Questions
Is an electric toothbrush actually better than a manual one?
For most people, yes — mainly because it removes the guesswork around pressure and timing, not because of the brush head itself. A manual toothbrush used with good technique can be just as effective; an electric brush just makes good technique easier to achieve consistently.
Should I brush right after eating?
Not immediately after acidic food or drinks (citrus, soda, wine) — the acid temporarily softens enamel, and brushing right away can wear it away faster. Wait about 30 minutes, or rinse with water in the meantime.
How do I know if I’m brushing too hard?
Splayed bristles within a few weeks of a new brush, gum recession, or sensitivity along the gumline are all signs. Switching to a soft-bristled brush and letting the bristles do the work — rather than pressing — usually resolves it.