Hi @JoeyLiz I think salt water works really well. My oncologist told me to avoid hot drinks an hour before and an hour after chemo. I sipped on iced water with ice cubes and fresh lemon during chemo as well.
I did these things and avoided ulcers. I also used a sensitive toothpaste which made a difference. I also avoided onion, chilli etc, but I think chemo makes you want to avoid those things anyway. All the best. x