If you haven't had your teeth cleaned in a long time or have had a lot of problems with your teeth, you may have to get a procedure called scaling and root planing, which involves cleaning the root surfaces of your teeth, which is more expensive than a routine visit.
The key background to this question is the nature of sound waves and light waves. Youâre right in that sound waves are a vibration traveling through an object, including condensed things like solids and liquids. In solids, those waves can consist of either alternating compressed and stretched regions, or regions wiggling sideways, compared to the direction the wave is traveling.
Sound Waves and the Eardrum. A sound wave traveling through a fluid medium (such as a liquid or a gaseous material) has a longitudinal nature. This means that the particles of the medium vibrate in direction which is parallel (and anti-parallel) to the direction which the sound wave travels. If the sound wave travels from west to east, then the particles of the medium vibrate back and forth along the east-west axis.