1. Why do wisdom teeth take longer to appear, and is it possible that they never erupt?
The normal age of eruption of third molars is 18 years, although it is true that there is considerable variability. In addition, in many cases wisdom teeth do not erupt straight and therefore they find a stop in the front molar and do not erupt, or even never erupt.
2. Is it always necessary to remove them and when is it essential?
In principle it is only indicated to remove them if they are molars that have erupted completely and are in occlusion, that is to say that they bite with the antagonist of the upper arch. However, if surgically the risk of surgery is high, either due to systematic problems of the patient or due to local complications of the third molar, such as proximity to the nerve or anatomical areas, expectant management may be indicated, i.e. an annual or biannual radiological control. When they give infectious symptomatology then extraction is always necessary.
3. How long does it take for the patient to recover after extraction?
Normally, in the case of young people the wound is closing after three days, but in the case of adults, diabetics or those taking blood thinning medications it may take more days. Therefore, it is necessary to go back to the dentist’s office to be checked by a specialist in dentistry, especially in cases where there was suturing.
4. Can dental crowding caused by wisdom teeth be prevented?
The relationship between post-orthodontic dental crowding and third molars has not been demonstrated. It is known that, whether third molars are present or not, orthodontics tends to recur and also mandibular growth is earlier, so that after orthodontics, in adulthood, crowding of the lower incisors is not directly related to third molars.
5. Why are they incompatible in many cases with Invisalign?
I believe it is not incompatible, but that is something that an orthodontist would have to answer for you.