<TABLE style="BORDER-RIGHT: medium none; BORDER-TOP: #b54342 1pt solid; BORDER-LEFT: medium none; WIDTH: 382.5pt; BORDER-BOTTOM: #b54342 1pt solid" cellSpacing=0 cellPadding=0 width=638 border=1> <TBODY> <TR> <TD style="PADDING-RIGHT: 3pt; BORDER-TOP: #999999 1pt solid; PADDING-LEFT: 3pt; BORDER-LEFT-COLOR: #ece9d8; BACKGROUND: white; BORDER-BOTTOM-COLOR: #b54342; PADDING-BOTTOM: 3pt; PADDING-TOP: 3pt; BORDER-RIGHT-COLOR: #ece9d8" vAlign=top> <P>Average radiation from outer space In Denver, CO (per year)</P></TD> <TD style="PADDING-RIGHT: 3pt; BORDER-TOP: #999999 1pt solid; PADDING-LEFT: 3pt; BACKGROUND: url(e) white; BORDER-BOTTOM-COLOR: #b54342; PADDING-BOTTOM: 3pt; VERTICAL-ALIGN: bottom; BORDER-LEFT: #999999 1pt solid; PADDING-TOP: 3pt; TEXT-ALIGN: left; BORDER-RIGHT-COLOR: #ece9d8"> <P>&nbsp;</P> <P>&nbsp;</P> <P>0.510 </P></TD></TR></TBODY></TABLE> <P>每年平均 为0.510 mVe （Denver， CO）。</P> <P>让我们算一下0.510/365天/24小时/60分/60秒=0.000000016172 mVe/秒</P> <P>而照一次牙片如9楼的link, 是0.038-0.15mVe/秒 （设曝光时间为1秒， 可能更短）。剂量看似不大，但时间短。想想看， 要穿透人的身体， 能量能低吗？ 能给太阳比吗？</P> <P>大剂量射线对人的损害在一秒或更短时间已经够啦。</P>

sorry this FAQ link was for 7th floor.&nbsp; <DIV id=Comment-Li-Content-0 class=Li-Content>&nbsp;<A href="http://www.ada.org/2760.aspx"><FONT color=#800080>http://www.ada.org/2760.aspx</FONT></A> </DIV>

to 6th floor, you can&nbsp;read at this link <A href="http://www.ada.org/2760.aspx"><FONT color=#800080>http://www.ada.org/2760.aspx</FONT></A>

<P>每人是不是每年都要让X线照一下， 包括几岁的儿童？ </P> <P>有保险我也不要吃X线。我是不相信医生说X线对身体没影响。尤其是美国的医生，像商人一样做生意。</P> <P>即使X线没影响， 不需要时， 也不应该乱用保险公司的钱。</P>

<STRONG>Not necessary!!! The dentist want to make easy money.</STRONG>

<P>I would like to know, which dental plan you have and which company, how much is monthly or annual fee? thanks</P>

<P style="MARGIN: 0in 0in 10pt" class=MsoNormal><SPAN style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 9pt">Most Insurance plans will pay for routing bitewings x-rays once a year and full mouth x-rays every 3-4 years under your preventive care policy.&nbsp; You know that insurance companies usually pay based on minimum standards to save money.&nbsp; So once a year bitewings is really a good idea so that your dentist can discover any minor issues early.&nbsp; If your dentist discovers any oral health issue, he/she may require more x-rays to diagnose the problem.&nbsp; If you are concerned about exposure of radiation, here is the link from American Dental Association <A href="http://www.ada.org/2760.aspx"><FONT color=#800080>http://www.ada.org/2760.aspx</FONT></A> .&nbsp; Remember, if you want to pay less for your dental bills in the long run, you should brush/floss your teeth really well.&nbsp; Visit your dentist at least twice a year (4 times if you have gum disease) for preventive care.&nbsp; Fix any decay when they are SMALL.&nbsp; This way, you will have a better chance not have expensive and painful root canal, crown and implant.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P> <P style="MARGIN: 0in 0in 10pt" class=MsoNormal><SPAN style="LINE-HEIGHT: 115%; FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 9pt">Most of us Chinese didn’t have good oral care when were young and we may all have some degree of gum disease.<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>So please take care your teeth before it is too late. If you take a good care of your teeth, you should have your original teeth when you are in 80s and 90s like most of Americans.<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN></P>

<P>楼主首先要说清楚你的“每次常规洗牙”有多常规？我的保险公司是每年4次常规洗牙，绝大多数是每年2次。</P> <P>照X线片一般是每年一次（除非你有特殊情况）。所以如果你每几个月或半年就去洗牙一次的话，不应该有每次照X线片的情况。</P>

跟国内大不相同。

一年一次報保險,好將投資機子的錢賺回來,也同時可比較你一年退步了多少.