辛达托福代报考位：到2017年9月8日上午托福官网没有释放考位，在此提醒广大考生抓紧时间报名，注意自己的考试时间，如对托福报名有任何疑问，欢迎咨询在线客服

　　Excess fluoride consumption has been studied as a factor in the following:

　　A weakening of bones, leading to an increase in hip and wrist fracture.[46] The National Research Council found the overall evidence "suggestive but inadequate for drawing firm conclusions about the risk or safety of exposures at [2 mg/L]", but states that fractures do seem to increase as fluoride is increased from 1 mg/L to 4 mg/L, suggesting a "continuous exposure-effect" dose-response relationship at these levels.[29]:170

　　Adverse effects on the kidney. Within the optimal dose, no effects are expected, but chronic ingestion in excess of 12 mg/day are expected to cause adverse effects, and an intake that high is possible when fluoride levels are around 4 mg/L.[29]:281 Those with impaired kidney function are more susceptible to adverse effects.[29]:292

　　Little research has been done on possible liver damage, although some studies suggest negative effects at chronic ingestion of 23 mg/day.[29]:292

大家在进行托福备考的同时，如果对考位方面也比较紧张，可联系辛达代报为您服务