Hi Monica

First the disclaimer, everyone is different, but this is what I experienced. I had induction chemo first, then surgery, finally the radiation. The radiation was by far the worst to get thru for me. I did keep and still have my teeth. My tumor was on the right side of my tongue so the mouthpiece was setup to allow beam access with minimal effect to my teeth.

I was one that had the privilege of having the worse case of Mucositis my doc (RO) had seen in a long while. I do not know much about lichen planus but I was in the position of anything my mouth was impossible except the occasional sip of water. So I was grateful for the PEG tube and had no problems using it.

After the radiation treatments are done, you're typically given time to heal before a scan (PET/CT) is done. If I remember correctly 3 months for me, and then annually for the fist couple of years. I haven't had one now since I crossed the 5 year mark.

Kevin