In general, if the wisdom tooth is growing out properly as there is sufficient space in the jaw to accomodate it, and it is biting on the opposing wisdom tooth which has also grown out well, there is no need to remove it. Many people have impacted lower wisdom teeth (wisdom teeth that don't have enough space to erupt or emerge) and the upper wisdom teeth grow out straight. In these situations, the upper wisdom teeth then become non-functional - they are not biting on any teeth and pose no benefit to keep them.
Wisdom teeth are the last tooth in the jaws, they are difficult to clean and maintain. If you experience difficulty keeping your wisdom teeth clean such that they are decayed and require fillings, you may want to consider removal, especially if all your other teeth are present and healthy.
Hope this helps, all the best.
Dr Geraldine Lee
Orthodontist, The Orthodontic Clinic