You’re using bristles that are too firm (or too soft)
Brush heads are important because their arrangement, stiffness, and bristle density have all been optimized to clean your teeth in very specific ways. If you’re using hard bristles and have sensitive teeth, that’s not good. In general, flatly arranged bristles are best for overall cleaning, but bristles that form a stuck-out point on the tip are good for cleaning gum pockets.
You’re not worried about gum health
Gums are not only the most neglected part of oral health, but they’re one of the most important. Aside from the fact that the Philips Sonicare DiamondClean promises healthier gums in general, our expert pointed out that the gum health setting offers a wider-cycle movement to clean the gum pockets and keep them tough.
You’re manual brushing in crazy circles or hap-hazard shapes
It turns out you probably shouldn’t also be rocking the circular brush strokes folks were taught about in the past. According to the Philips dental folks, the right movement is short, quick back-and-forths with that 45-degree angle mentioned earlier, and then a quick, flicking sweep from the gumline to the biting edge of the tooth.