A professional tooth cleaning means removal of soft and hard deposits from your teeth that cause cavities. The main reason of having your teeth cleaned is to prevent or delay the progression of gum diseases. Getting your teeth cleaned is not the only way to prevent gum diseases -- smoking has been implicated in approximately 50% of periodontal disease cases in adults.
The frequency of professional teeth cleaning depends on the health of your teeth and gums, for example healthy children and adults should have their teeth cleaned at least once every year or two. If you’re a smoker or have a tendency to get gum infections you should visit your dentist more often. It’s a good idea to actually ask your dentist how often you should visit their office.