Use alcohol-free mouth rinses to reduce risk of dry mouth (xerostomia). A low-sucrose diet free of caffeine, spicy, and acidic food is helpful, as is drinking fluoridated tap water. Another issue called osteonecrosis, or bone breakdown from poor blood supply, may occur and cause pain and swelling. Treatment may include broad-spectrum antibiotics, saline irrigations, or hyperbaric oxygen therapy. If you’re experiencing mouth infections, your doctor may prescribe medication such as fluconazole.