Wisdom teeth are the molars (back teeth) that come through last, usually in your late teens or early 20s.
There are normally four wisdom teeth – two in the upper jaw and two in the lower jaw – but some people have more, fewer, or even none at all.
Sometimes, a wisdom tooth comes through at an angle and pushes into the gum or the tooth beside it.
This is called impaction, and it can be painful and make the area difficult to keep clean.
When there is not enough room in the jaw for wisdom teeth, it can stop them coming through properly. Brushing these teeth can be difficult.
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Youtube / Cardiff Dental
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