Most commonly fillings are used to fill cavities in the teeth, but they can sometimes be used to repair chips, cracks, and fractures.
In preparation for your treatment your dentists will numb your teeth and the surrounding areas including the gums and skin to avoid discomfort.
Any decay in the tooth will be drilled out and then the hole filled with the filling. Administering the filling itself will only take a few minutes, but depending on the work needed to prep the tooth will determine the length of the treatment.
After your treatment you may find your mouth will remain numb for a few more hours. If this lasts longer than a few hours consult your dentist.
If you have amalgam (silver) fillings, it may be worth getting these replaced with longer-lasting composite teeth fillings as soon as they become cracked or worn out; unfortunately this can happen over long periods of time.