My 57 yr old dad is going thru his third time with breast cancer. The first time (1995) was radical mastectomy, radiation and chemo. The second time was lumpectomy and Tamoxifen, and this time they did a lumpectomy followed by chemo. His dental health was fair, no cavities or problems, but Tuesday afternoon one of his front bottom-center teeth fell right out, no breakage, just fell out and another one is barely hanging in there. Is this possibly a chemo side-effect? Any information will be greatly appreciated!