I've had ulcer like patches all over my tongue for about 6months+, sometimes it can be really sore and painful. I don't drinks fizzy drinks or many hot drinks. I mainly drink water and I've tried changing water bottles and drinking from just new bottles every time. I don't eat many aciddy foods. I have no idea what it could be, I used to wear retainers but stopped wearing them as thought mayb it was them but hasn't changed anything? I don't often go to my GP as I get embarrassed easily.