如何正确清洁牙齿
<p><span word="You">You</span> <span word="need">need</span> <span word="to">to</span> <span word="systematically">systematically</span> <span word="go">go</span> <span word="round">round</span> <span word="all">all</span> <span word="the">the</span> <span word="surfaces">surfaces</span> <span word="of">of</span> <span word="your">your</span> <span word="teeth">teeth</span> <span word="with">with</span> <span word="fluoride">fluoride</span> <span word="toothpaste">toothpaste</span>, <span word="for">for</span> <span word="at">at</span> <span word="least">least</span> <span word="two">two</span> <span word="minutes">minutes</span>, <span word="twice">twice</span> <span word="a">a</span> <span word="day">day</span>. <span word="Unfortunately">Unfortunately</span>, <span word="we">we</span> <span word="live">live</span> <span word="such">such</span> <span word="busy">busy</span> <span word="lives">lives</span> <span word="that">that</span> <span word="putting">putting</span> <span word="two">two</span> <span word="minutes">minutes</span> <span word="aside">aside</span> <span word="feels">feels</span> <span word="like">like</span> <span word="a">a</span> <span word="lifetime">lifetime</span> <span word="for">for</span> <span word="some">some</span> <span word="people">people</span>.</p><p>你需要有系统地使用氟化物牙膏绕你牙齿的所有表面，持续至少两分钟，一天两次。不幸的是，我们过着忙碌的生活，所以留出两分钟对一些人来说就像一辈子一样。</p><p><span word="Your">Your</span> <span word="teeth">teeth</span> <span word="tend">tend</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="bit">bit</span> <span word="softer">softer</span> <span word="just">just</span> <span word="after">after</span> <span word="eating">eating</span>, <span word="so">so</span> <span word="wait">wait</span> <span word="at">at</span> <span word="least">least</span> <span word="half">half</span> <span word="an">an</span> <span word="hour">hour</span>. <span word="Then">Then</span> <span word="brush">brush</span> <span word="all">all</span> <span word="along">along</span> <span word="the">the</span> <span word="gum">gum</span> <span word="line">line</span> <span word="with">with</span> <span word="a">a</span> <span word="little">little</span> <span word="scrubbing">scrubbing</span> <span word="action">action</span>. <span word="Don">Don</span>'<span word="t">t</span> <span word="press">press</span> <span word="too">too</span> <span word="hard">hard</span>, <span word="or">or</span> <span word="to">to</span> <span word="be">be</span> <span word="too">too</span> <span word="light">light</span>.</p><p>吃完东西后，你的牙齿会变软一点，所以至少要半个小时后才能刷牙。然后沿着牙龈线轻轻洗刷一下，不要太用力，也不要太轻。</p>
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