Do teeth lean if a upper second molar was extracted before wisdom teeth grows in?

2d molar replacement: The wisdom tooth can replace an extracted second molar. However, your dentist needs to assess the developmental status of the wisdom tooth. See your dentist for eval.

Sometimes: Depending on the presence and orientation of the adjacent wisdom tooth, it may be possible for it to take the space of the extracted tooth, usually by tipping. That may be ok or it may require orthodontic intervention to move bodily into place. Get a dental evaluation to better understand the specifics of your situation.

They may: If the pressure from chewing is at the right angle, the teeth may lean into the extraction area. Usually this does NOT happen to the upper first molar because of the nature of its biting surface and for other reasons. This is assuming that your lower teeth are present and reasonably in position. Have your dentist keep an eye on it.

Sometimes: Lower 2nd molar may over erupt, creating occlusal problems that may cause joint dysfunction. Upper 3rd molar smaller than 2nd and cannot be relied upon to erupt into the 2nd molar's position. It would be wise for your Dentist to refer you to an Orthodontist, a tooth positioning specialist, for guidance.