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You don't need permission to make changes to an article in Wikipedia. By the same token, anyone can revert those changes.

If your, or a student's, work is reverted, it's best to try to understand why. Start by looking for the rationale given by the person making the change. The preferred place to do that the article's talk page, so check there first. Often, people give their reasons in their edit summary, which you'll find on the 'history' tab of the article. Finally, look on your (or the student's) talk page. If they haven't posted a reason, you can go to the talk page of the person making the edit, and ask them.

In any event, do not undo the edit without attempting to discuss the issue.