是负相关。
“The AAE noted research published in 2013 concluded that individuals who underwent multiple endodontic treatments actually experienced a 45 percent reduced risk of cancer. ”
文章源自美国著名的打假网站 snopes.com,链接:http://www.snopes.com/medical/toxins/rootcanal.asp
其中45%的数据源自JAMA的这篇论文:http://archotol.jamanetwork.com/article.aspx?articleid=1752294