A tooth which is damaged is very decayed or damaged, or loose because of gum disease, may have to be extracted (taken out of your mouth).
Wisdom teeth sometimes have to be extracted if they have come through at an awkward angle and are causing other probelms such as decay in adjacent teeth or are difficult to clean causing infections.
Some teeth are easier to take out than others. A local anaesthetic will be used to numb the tooth before it is extracted. In some cases sedation with a local anaesthic may be used for those patients who are nervous.
Most people experience very little post-extraction discomfort. You should not smoke or drink alcohol for at least 24 hours after an extraction.