Has anyone researched Salivary Gland reconstruction?

As a lot of us are suffering from is damage done by radiation on our salivary gland(s). Has anyone been researching the possibility of restoring your lost salivary gland? I'm almost 3 months out of radiation on Rt Tonsil HPV, and I am worrying my saliva will never be the same? Sometimes I think I feel saliva, but really I'm not sure? I have dry mouth, but it's better than it was 1 month ago.
I googled what is happening now with restoration and it is Gene Therapy and Stem Cell research? There are doctors and scientists trying to find a solution due to the numbers of patients ever increasing. There is also a YouTube video from a doctor whose father had neck cancer and lost his gland. She is very motivated to help. Has anyone found success or encouraging news from your ENT or Oncologist about restoring functions?
It's a real problem for eating, speaking, and exercising. Plus, not to mention the dental problems. I'd love to hear what everyone has learned? Thanks, Tim