[/url] 2010年9月20日是第二十二个全国“爱牙日”。今年的活动主题为“窝沟封闭，保护牙齿”。
今天是爱牙日，咱们来探讨下关于牙齿的问题。先看张图片： [url=http://bbs.ebigear.com/thread-138350-1-1.html]
大家对罗纳尔迪尼奥那标致性的门牙已经不再陌生了，瞧瞧，原来龅牙还有这种用途：还可以用来开酒瓶！……
这名英国设计师用小罗的卡通形象制作了一批瓶盖起子，身穿黄色球衣的瘦削身体是手柄，大大的脑袋是起瓶盖的端头，“小罗”张大了嘴巴在笑，正好暴露出那两颗龅牙，只要把酒瓶口放进“小罗”的嘴巴里，用手轻轻一扳，酒瓶盖儿就被那两颗门牙“咬”下来了。
牙齿的保健：
要想有一副健美的牙齿，必须注意牙齿的保健，多吃含钙丰富的食物。特别是在婴幼儿时期就应注意饮食的选择。 家长应给孩子多吃能促进咀嚼的蔬菜，如芹菜、卷心菜、菠菜、 韭菜、海带等，有利于促进下颌的发达和牙齿的整齐。常吃蔬菜还能使牙齿中的钼元素含量增加，增强牙齿的硬度和坚固度。实验证明，厌食蔬菜和肉类食品的幼儿，其骨质密度均比 吃蔬菜和肉类食品的幼儿低下。常吃蔬菜还能防龋齿，因蔬菜中含有90%的水分及一些纤维 物质。咀嚼蔬菜时，蔬菜中的水分能稀释口腔中的糖质，使细菌不易生长；纤维素能对牙齿起清扫和清洁作用。此外，多吃些较硬的食物有利于牙齿的健美，如玉米、高粱、牛肉、狗 肉及一些坚果类，如橡实、瓜子、核桃、榛子等。
history in September 20:
In 1870, Italian troops took control of the Papal States, leading to the unification of Italy.
In 1881, Chester A. Arthur was sworn in as the 21st president of the United States, succeeding James A. Garfield, who had been assassinated.
In 1884, the Equal Rights Party was formed during a convention of suffragists in San Francisco. The convention nominated Belva Ann Bennett Lockwood for president.
In 1947, former New York City Mayor Fiorello La Guardia died.
In 1962, black student James Meredith was blocked from enrolling at the University of Mississippi by Governor Ross R. Barnett. (Meredith was later admitted.)
In 1963, President Kennedy proposed a joint US-Soviet expedition to the moon.
In 1973, singer-songwriter Jim Croce died in a plane crash near Natchitoches, Louisiana; he was 30.
In 1979, Jean-Bedel Bokassa, self-styled head of the Central African Empire, was overthrown in a French-supported coup while on a visit to Libya.
In 1984, a suicide car bomber attacked the US Embassy annex in north Beirut, killing a dozen people.
In 1989, F.W. de Klerk was sworn in as president of South Africa.
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