Why Are Your Teeth Stubbornly Refusing to Whiten?
At-home teeth whitening kits often promise to show results within a certain number of days or weeks. You might not take these promises at face value, but after using the product for the period of time which should deliver results, your teeth have rather stubbornly refused to whiten—and may not have changed their colour in any noticeable way. So why are your teeth failing to respond to whitening treatment? Accumulated Plaque