Comment:
http://file.scirp.org/Html/36073.html https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289134/ http://www.digitaltrends.com/cool-tech/stem-cell-regrow-teeth/ http://phys.org/news/2015-10-regrow-tooth-fishyes-humansmaybe-day.html http://linkinghub.elsevier.com/retrieve/pii/S1882761612000610?via=sd&cc=y http://www.livescience.com/33130-why-are-teeth-not-considered-bones.html
