I had 4 root canals the 10 months prior to my diagnosis. After my diagnosis my husband stated that he thought those root canals & my fatigue were most likely signs that cancer was growing in my body. I had discounted it since I had a normal mammogram in Aug & felt a lump in Dec & 2 of those root canals were at the beginning of the year. Hearing this from someone else makes me think he was probably right. So far my teeth have held up post chemo but I also bite through a lot of mouth guards.