There is a condition called burning mouth syndrone. I had it. I had to find out what was causing it. After 3 long months og agony, cause it just came on suddenly, I come to find it is a certain medication I was taking and getting injected during my trigger point injections. For me, it was a med called marcaine. When I stopped having that injected ( for pain), the burning mouth went away. It happens for all reasons, but sugars could be yr culprit and it's in everything. try figuring it out, dont eat anything for a while with sugar and see if it goes away, or maybe it is in a particular med yr taking. I wouldnot believe for me it was menopause or old age. lol Im only 59 but look 40 and i dont feel old. I was glad I found the culrpit cause it hasnt happend since.