Most commonly, everyone needs dental cleanings every 6 months because that is how long it takes for plaque and tartar to accumulate on the surfaces of teeth. However, depending on your dental history or risk of periodontal disease, you may require cleanings more frequently – every 3 months or 4 months. Your dentist will make a clinical judgement based on your dental history as to how often you should get cleanings for optimal dental and periodontal health.