White teeth are widely [revelled / revered] in many countries. Hollywood, advertising, and social media have helped to make ultra-white teeth a must-have, and even an [obsessive / obsession] . For [decades / decadence] , people have used peroxide-based chemical whiteners in an attempt to get a perfect [stet / set] of "pearly whites". However, these chemicals can damage the teeth and gums. Help is now at [palm / hand] for those of us who have stained or [off-white / egg white] teeth. Researchers in China say they have created an [effective / affective] teeth-whitening ceramic powder. Researcher Min Xing said it is "a safe, at-home teeth-whitening strategy integrating whitening, enamel [disrepair / repair] , and microbiome balance [for / at] long-term [oral / aural] health ".
The researchers wrote about how their new powder [workings / works] . It is activated [by / of] electric toothbrush vibrations, which create a small electric [pitch / field] over the teeth. This causes a reaction [knowing / known] as "reactive oxygen species". These are [compounds / impounds] that break [down / over] stain-causing molecules. The researchers said their laboratory [trial / trials] were very promising. They tested human teeth that were artificially discoloured with tea and coffee. After four hours [off / of] brushing, there was visible whitening. After 12 hours of cleaning, the teeth were 50 per cent whiter than those brushed [on / with] saline. The researchers said the next step is to incorporate the powder [into / unto] a toothpaste.
