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Good evening! That is a great picture, and I do not see any signs of concern on either tooth number 8426 number six. Unfortunately there is no way to know whether or not these two teeth will also suffer any long-term consequences of the injury to this area. In order to monitor tihem very closely, you should make sure your dentist is taking an x-ray called a PA at least once every year. This x-ray enables them to see the entire tea of each root. This is not something that is routinely done, and you may have to request it.
Does that answer your question?
I don't know an actual number because it can literally be all across the board. In some people, root resorption happens very quickly after a traumatic injury. And in others, it can be decades before a problem arises. There is no accurate predictor for it, as far as I know.
The only preventive thing I would recommend is a nightguard to prevent any additional trauma to those teeth from clenching or grinding your teeth. Has your dentist ever recommended a nightguard?
Okay! That's great! That will be the best protection against what we call "microtrauma" (trauma that happens in very small increments over a long period of time).
Please let me know if you have any other questions.