Well, two weeks ago my upper front tooth came completely out when I slipped. I went to a dentist who put the tooth back in place and told me to wait two weeks to see if my body rejects it or not. I went in today and he told me my body accepted the tooth and that he would do a root canal and put a crown on. My question is, since my tooth is getting stronger and healing on its own, do I need a crown? I really don't want my tooth ground down and put in something that might fall off in a couple of years. What do ya'll think??
If your tooth came completely out, its root has been severely damaged. Putting it back in place is something Im a bit surprised can work, but seems plausible to me.
Now, it is also very probable the interior of your tooth (pulp) is not vascularized anymore, and will come to necrosis soon. That's were you probably need the canal treatment. The crown comes almost naturally after the canal.
See here for images.
Also, crowns, if well placed (I assume your dentist knows its stuff), can last for 3-20 years (depending of the quality of the material, quality of placement, buccal hygien etc etc).