I have got my assessment day next Tuesday and then they schedule a start date. I have already had surgery and I will be on TCH x 6. My cancer was tiny and no lymph nodes but HER2 positive.
My sister-in-law had chemo for Non Hodkinson's Lymphoma and suffered terribly with her mouth and her doctor said she should have them. Cannot remember if they were a prescription or she just bought them. Anyway they are for people with gum disease, see this:
http://www.biogaia-prodentis.com/faq/
and this:
http://www.ncbi.nlm.nih.gov/pubmed/?term=lactobacillus+reuteri+prodentis
Ask your nurse/doctor if they are ok to take but they are about £20 on Amazon.
I have been advised to use Biotene and to suck one of these for a few days after your session
https://www.amazon.co.uk/gp/product/B0179O4A32/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
I am waiting to start so no idea if they work but I have bought some and will take one for 5 days after each session then the whole pack of 30 should see me through. If you do try them let me know if they are any good.