买牙膏要用小包装
<DIV class=t_msgfont id=postmessage_1508805><DIV id=firstpost>小管牙膏又不方便又贵，所以很多家庭选择大包装的牙膏。其实，往往小管牙膏更利于健康。<BR><BR><BR><IMG alt="" src="http://image.39.net/094/8/346821_p_1000_02.jpg" onload="attachimg(this, 'load')" border=0><BR> <BR><BR><BR><BR> 一管牙膏不要用太久，因为牙膏使用时间越久，管口暴露在空气中的机会就越多，同时与牙刷的接触频率也就越高，接触细菌的机会也就大大增加了。<BR><BR> 此外，大包装牙膏随着使用的频繁不断有空气灌注和接触，会导致牙膏膏体变硬，变得不那么好用，因此，小包装牙膏有着更好的新鲜的口感。<BR><BR> 如果是使用小包装牙膏的话，则可以一家人分用几管牙膏，这样可以避免口腔细菌的交叉影响和感染。<BR><BR> 如果一家人合用一管牙膏，所有人口腔中的细菌都会在管口聚集，随后又被别人的牙刷带走。<BR><BR> 所以说，在越多人使用同一管牙膏的时候，牙膏管口的细菌存积就会越来越越多，细菌传播的几率也就越高。</DIV>
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</DIV> 学习了，宝贝辛苦！
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