You should see your dentist at least once in every six months or more often to keep your teeth clean. Getting your routine dental check-up every 6 months helps your dentist to detect any new cavities or decay in its initial stage. This way you can be treated for any dental problem at its initial stage itself, instead of undergoing painful and costly treatment at the later stages. If the dentist detects some dental problem then he might ask you to come more often to get the problem fixed.