Depending on what type of cleaning you receive and how often you go for appointments, the length of time spent in the chair can vary. A standard prophylactic cleaning usually takes about 45 minutes, while a periodontal cleaning can typically last up to an hour or more. During the procedure, all visible plaque will be removed from your teeth with special instruments as well as thorough flossing and polishing. X-rays may also be taken if needed in order to look further into any potential issues.