While there are some people who are born without wisdom teeth, the rest of us have to deal with them sooner or later. As you start to get out of your teens, your wisdom teeth generally begin coming in and pushing the rest of the teeth forward, and have the potential to ruin any orthodontic work that you may have done in the past.
Many people are able to see their wisdom teeth coming in, but many others are able to recognize that they are there due to symptoms or infections. You may notice that some of the gums are still covering the wisdom tooth if it is not possible to get them in.
This can allow bacteria and bits of food to enter the gums under the flap. Pericoronitis, a small infection caused by the swelling of the gums, can develop if it's left untreated. This is the most common problem with wisdom teeth in the lower jaw. It is the main reason why wisdom teeth are removed.
This is a painful symptom. There are many other reasons to get your wisdom teeth extracted. Sometimes, other teeth or the bone prevent the wisdom teeth from fully coming in. These are called "impacted" teeth and can cause pain.
These impacted teeth can cause some discomfort, but they could be dangerous to your oral hygiene. These include infection, crowding, damage and decay in your mouth.