Rheumatoid arthritis is a common autoimmune disease characterized by chronic inflammation of the joints. It mainly affects the small joints of the hands and feet symmetrically. As the disease progresses, damage to the cartilage and bones occurs, which can lead to permanent disability and significantly reduce the patient's quality of life. Rheumatoid arthritis has numerous extra-articular manifestations and has been shown to affect oral health. Periodontitis is more common in patients with this autoimmune disease. Periodontitis and rheumatoid arthritis are linked by similar inflammatory pathomechanisms, cytokines and a similar mechanism of bone damage. Although rheumatoid arthritis initially affects the joints of the hands and feet, as the disease progresses other joints are also affected, including the temporomandibular joint. Secondary Sjögren's syndrome, which attacks the salivary glands and causes reduced saliva secretion, is also associated with rheumatoid arthritis. Xerostomia can be a result of both the disease itself and the use of medication. Oral ulceration can be caused by the medications used to treat rheumatoid arthritis. A dentist must be familiar with the oral manifestations of rheumatoid arthritis. Dental treatment must be tailored to the patient, taking into account their medical history.