This is another form of sedation to keep the patient comfortable during dental treatments. During IV sedation, the sedative is introduced directly into your blood by an IV. The intensity and level of sedation is adjusted according to the pain levels to keep you as comfortable as possible.
In addition to this, your local dentist might also use local anesthesia to numb the area. The IV sedation will take you into a state of enhanced relaxation and you might in all probability not remember any part of the dental procedure later on.
If going for dental treatment has been making you too nervous to undergo procedures, ask your dentist for sedation options available.