Regular dental cleanings are an important part of maintaining your oral health. Even if you are brushing and flossing regularly, there are places a toothbrush cannot reach. For this reason, professional cleanings are advised to remove hardened plaque and tarter.
Keep in mind that there are different types of cleanings, and re-care schedules (3 months, 6 months, etc...). Your dentist will determine what is best for you.