Nitrous gas can be used for a variety of dental treatments, including tooth cleaning and cavity filling. Certain operations may also necessitate the use of local anaesthetic. During these procedures, a dentist will want to make sure that any cavities are filled properly to prevent pain later on. When used in this way, the gas is called "nitrous" or "laughing gas". It is administered in very small doses through a mask placed over the patient's mouth. The dentist controls the amount given at each visit. This is done by injecting gas into a plastic bag attached to the mask. The patient breathes in more slowly than normal while the doctor inserts the needle into a tooth or jawbone to inject liquid dope containing medicine-namely, a local anesthetic-into the area. The dentist then removes the needle and tells the patient to breathe normally as the drug takes effect. When the patient opens their mouth, they will notice the air is rushing out because there is not enough gas present to obstruct their breathing. Once the patient is awake and aware of their surroundings, the dentist can proceed with the procedure. There are many different forms of treatment used by dentists to keep your teeth healthy.