<s>[INST] i have had dentures since 2006. hey don t fit well anymore and i need to get them replaced. i use fixodent and installed a soft liner (pro soft) so they aren t sliding around. my problem is i have been noticeing that my gums on the top front (where the teetChatDoctore thru the gums) have a whole different texture and turning like a see thru white. like layers. and on the bottom gums i m getting black spots on my gums and like red blisters (no pain) under my tongue. [/INST] Hello, thank you for consulting with Chat Doctor. The kind of symptoms you are mentioning, it appears that your gums are infected because of improper cleaning, and may he because of habit of smoking. In patients those who do not have teeth this appears because of continuous irritation of food or denture on the area. Better you visit your dentist and get complete examination done to get it cleared. Even the blister you are mentioning below tongue can just be a normal finding. Hope it will help you. </s>