Headphones that go over your ears can also damage your hearing if you use them too long or play music too loudly. They're just not as much of a risk as earbuds are: Having the source of the sound in your ear canal can increase a sound's volume by 6 to 9 decibels â enough to cause some serious problems.
Dental hand instruments. Instruments used for examining the mouth and teeth. Mouth mirrors are used to examine the condition of the teeth and mouth, as well as to retract the tongue and cheeks upon examination. Probesâ There are many probes available but the main types are the straight probe, Briault probe and periodontal probe.
The types of hand instruments can be categorized based on their function: 1  Examining the mouth and teeth. 2  Scaling or professional cleaning of teeth. 3  Cutting teeth and removing cavities.  Placing and condensing filling 1  materials. Carving and finishing dental fillings.  Miscellaneous types.