Clear, plastic aligners have been growing in popularity as alternatives to bulky, metal braces. And once the teeth are straightened, patients graduate to plastic retainers to maintain the perfect smile. But these appliances can become contaminated, so one group is now reporting that they have developed a film to prevent bacteria from growing on them.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/05/180523133250.htm
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