I didn’t have to do chemo but know of others who had dental issues related to chemo. I suggest asking your dentist for a referral to a dental specialist like an endodontist or peridontist who have training and experience in more challenging dental situations. Lots of dentists and dental specialists do have training in dealing with the challenges that cancer patients have.
When I was undergoing my TURBTS and BCG treatments, I had a flare up of my old friend gingivitis. I went for extra cleanings and used a stronger mouthwash to help cut down on the plaque build up and gum inflammation. This worked in my case. ((((HUGS))))