Dental cleanings are the first thing your dentist or hygienist recommends every time you go for a dental check-up. It is good to get professional dental cleaning done twice a year or once every six months. In this procedure, your hygienist or the dentist uses an ultrasonic machine called a scaler to clean off the tartar build-up on your teeth. You may experience some vibrations and noises during the procedure as this machine uses ultrasonic vibrations and a water jet to clear off the debris from your teeth. It is generally painless unless there are large deposits of tartar on your teeth.