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    It may sound too good to be true, but German researchers have created a sugar-free candy they say can actually fight cavities.    The development, reported by Medical News Today, involves lacing the candy with dead "good" bacteria that bind1 to "bad" cavity-producing bacteria in the mouth to block tooth decay.   Researchers from the Berlin-based firm Organobalance GmbH, who developed the candy, noted2 the human mouth contains a variety of good and bad bacteria. Mouthwashes, along with brushing, flossing(牙线,丝棉), and cleaning our teeth help to knock out cavity-causing, gum-damaging bad bacteria, while allowing beneficial oral bacteria to thrive.    Poor oral health has been linked to many health conditions, from heart disease to Alzheimer's to pancreatic cancer.    In new research published in the journal Probiotics and Antimicrobial Proteins, the German researchers noted bacteria that remain on the surface of the teeth after we eat release acids, which can dissolve the tooth enamel3, leading to cavities. The most netmon strain of these "bad" bacteria are called Mutans streptococci. But another bacteria called Lactobacillus paracasei reduce levels of the cavity-causing bacteria in animal studies, decreasing the number of cavities.    The team, led by Christine Lang, sought to determine if binding4 the two bacteria together would prevent this bad bacteria from reattaching to the teeth, causing them to get washed away by saliva5(唾液).    In a study involving 60 volunteers, Lang and her team tested whether their sugar-free candy, which contained heat-killed samples of L. paracasei, reduced levels of bad oral bacteria. One-third of the subjects ate candies with small amounts of the dead bacteria, a second group ate candies laced with higher levels, and a third ate bacteria-free candies.    All participants ate five candies during the two-day study and were not allowed to perform any oral hygiene6 activities during this time.    The results showed that nearly 75 percent of the participants who ate candies with the good bacteria had "significantly lower" levels of bad bacteria in their saliva than those who ate bacteria-free candy. In addition, the higher the levels of the bacteria in the candy, the greater the reduction of the bad bacteria.   "Additionally," the researchers added, "sugar-free candies stimulate7 saliva flow, a benefit to oral health."
    1 bind      vt.捆,包扎;装订;约束;使凝固;vi.变硬 参考例句:
    I will let the waiter bind up the parcel for you.我让服务生帮你把包裹包起来。
    He wants a shirt that does not bind him.他要一件不使他觉得过紧的衬衫。
    2 noted      adj.着名的,知名的 参考例句:
    The local hotel is noted for its good table.当地的那家酒店以餐食精美而着称。
    Jim is noted for arriving late for work.吉姆上班迟到出了名。
    3 enamel      n.珐琅,搪瓷,瓷釉;(牙齿的)珐琅质 参考例句:
    I chipped the enamel on my front tooth when I fell over.我跌倒时门牙的珐琅质碰碎了。
    He collected coloured enamel bowls from Yugoslavia.他藏有来自南斯拉夫的彩色搪瓷碗。
    4 binding      有约束力的,有效的,应遵守的 参考例句:
    The contract was not signed and has no binding force. 合同没有签署因而没有约束力。
    Both sides have agreed that the arbitration will be binding. 双方都赞同仲裁具有约束力。
    5 saliva      n.唾液,口水 参考例句:
    He wiped a dribble of saliva from his chin.他擦掉了下巴上的几滴口水。
    Saliva dribbled from the baby's mouth.唾液从婴儿的嘴里流了出来。
    6 hygiene      n.健康法,卫生学 (a.hygienic) 参考例句:
    Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识。
    He's going to give us a lecture on public hygiene.他要给我们作关于公共卫生方面的报告。
    7 stimulate      vt.刺激,使兴奋;激励,使…振奋 参考例句:
    Your encouragement will stimulate me to further efforts.你的鼓励会激发我进一步努力。
    Success will stimulate the people for fresh efforts.成功能鼓舞人们去作新的努力。

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