When a tooth gets filled for a cavity, a dentist will need make adjustments in order to treat the infected tooth. If the cavity to be treated is in between two teeth, the affected tooth is isolated using a metal wedge. The wedge is placed between adjacent teeth so they are safe from damage. A dental dam is also placed to prevent tooth fragments from entering the throat.
The dentist will also insert a small hose that will suck your saliva to keep the mouth clean.

Once this is set, the dentist will rub sum anaesthetic ointment on your gums. This makes the Novocain shot less painful. Novocain is a local anaesthetic that is used to reduce pain during dentistry procedures. Although the long needle looks threatening, it doesn’t hurt at all most of the time.

When the Novocain has taken effect, the dentist will start removing the cavity using a small drill. The drill noise is the main reason why people flinch when thinking of dental procedures. The drilling gives off a soft burning smell and a grinding sound.

The depth of the drilling depends on how deep the cavity is. After the bad parts are removed, the dentist will make a filling paste. Using a thin needle like instrument as a spatula, he will fill the drilled region with the paste. When he is satisfied with the filling, he’ll use a UV light source (shaped like a small torch at the end of a tube) to harden the filling.

Using another drill, the dentist will shape the filling so it replicates the shape of your tooth. This process does take a bit of time as the dentist needs to be sure. Uneven filling can be very irritating and requires another dental appointment to correct. During the shaping process the dentist will make you bite on a piece of ink-paper and will observe the tooth mark for reference.
Once he is satisfied, he’ll take a few minutes to clean, buff and shine the tooth to finish the job. The apparatus will be removed from your mouth and you will be free to go.

The Novocain takes a few hours to wear off. As the effect fades away, there are tingling sensations and a general feeling of a heavy jaw. It isn’t much and will soon wear off.