Just watched a program on SBS where new research is discovering how important microbes in our mouth, stomach and intestines are to our overall health.
Re-instating missing microbes was reported as curing depression, cancer etc (in certain cases)
http://www.sbs.com.au/ondemand/video/234273859562/Life-On-Us
http://www.sbs.com.au/ondemand/video/234273859563/Life-On-Us