Hi Dear, Welcome to HCM. Understanding your concern. Thanks for your query . The symptoms you mention in query is a condition known as STOMATITIS . Stomatitis occur due to various reasons like canker sore ,cold sore or irritation . In your case it seems to me that the denture is irritating the mucosa which is responsible for stomatitis . Stomatitis results in ulcers on roof of the mouth , ulcer at the site of molar and swelling of gums . Usually wear and treat of denture occur with long times use which create sharp points on denture which irritate mucosa and leads to stomatitis . I would suggest you to consult dentist for proper examination and rule out condition like periapical abscess , periodontal abscess , allergy or oral herpes. Doctor may give you another denture ,prescribe antibiotics (amoxicillin) , steroid topical gel . For now apply orabase gel on sores , do Salt warm water rinses , betadine rinses , avoid hot and spicy food and do not wear denture until you visit dentist. Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari