Renee from Boston asks:
During a retreat of a root canal in my last lower left molar (#17?) it was discovered that the tooth is cracked thru to the bottom and must be extracted. I read the thread on your website discussing implants vs. bridges and it does sound as if a dental implant is preferable BUT in the case of the last tooth, why can't I do neither? What would be the problem if I didn't do a bridge or an implant? Are there any risks?