Martin was told to use Gelclair because of a painful "mouth ulcer" but he kept complaining the "ulcer" was sharp. They didn't even look in his mouth properly! I am the one who did the doctor thing at home with a wooden stick and told him to say "aaaaaaaaaaaaaah", and I found the mysterious ulcer which was hurting him, it was a piece of bone sticking out of his gum! I was furious, how could they miss that. the next week I was there at the consultants and I told the doctor "you stand behind me and I will show you the bone, it's not an ulcer".
Otherwise for the normal ulcers Gelclaire worked a bit but he could never last an hour with sipping some water. We also used Bonjela.
Keep positive, it does get worse but then slowly slowly things come back.