Dental Help

In the last year and a half, I have had trouble with my fillings falling out, my dental caps coming off and overall, my teeth have gone from good to really bad.  I can not afford a dentist to get the help that I need.  I am 65 and retired and I have been losing weight like crazy.  I once weighed 190 pounds in my younger days but now I am at 148.  I can't seem to eat anything and keep it down.  I think that my teeth problem has caused the rest of my body to go south.  Can my teeth have an affect with the rest of my body losing weight?