All in all, you should have at least twice a year for dental cleanings and check-up examinations.  You will save time and money by treating all dental problems as soon as they occur and greatly improve your oral health. In fact, some research suggests that those in good dental health will actually live longer than people who do not take care of their teeth. It is also important for people without teeth to see their dentist at least once a year. In addition, the dentist will need to check the fit of removable dentures and also look for any signs of oral cancer.