Dental hygienist here. Use a mouthwash that is alcohol free. Cloysis is a good one, a little pricey but excellent for mouth sores. Walmart and pharmacies have it.
Mouth sores from RA medications, like methotrexate, can be managed in several ways. Folic acid supplementation can help reduce ulcers caused by methotrexate. If the sores are painful, a mouthwash with numbing medication may provide relief. It's essential to inform your doctor about these symptoms so they can adjust your Show Full Answer