Can a tooth be bruised?

[Heatherm4]

My 2 year old bumped into another child at the park and she hit her front top teeth directly on a bar. She already had a gap between her teeth but the two (front left and one beside it) shifted slightly. Her gums looked terrible for a couple days but healed fine. Her two teeth were quite wobbly and now have gotten better.
But now….almost a month later and after soft foods for 3 weeks (1 week longer than instructed) her tooth seems to be darker. Not on the outside but if you shine a light or look from under it seems darker on the inside. I pray to god it isn't rotting. I don't see any signs of decay along the gums or anything. I'm terrified it's dying on her :(
Is it just possible bruising? Does it take a really long time for the tooth to die if the nerves were damaged?
I know it's just a baby tooth and her adult teeth will be fine but she's only 2 and a girl!! lol It sounds terrible I know!

[Heatherm4]

Just a follow up. Now her tooth is looking great! I was terrified that it was dying and that she would end up losing it.
Now it has definitely tightened and it is basically back to the regular colour. Her gap between her teeth is just larger now since her tooth moved a bit and theres a slight chip.
All well now :)

[Heatherm4]

Thanks so much! She hasn't had any swelling since the original accident. I always check on it just to make sure. She never complains of it hurting either which I have taken as a good sign.

[DrMah]

Yes it is possible for a tooth to become bruised but usually that is an adult tooth and the ligament that holds the tooth in gets inflamed. On a primary tooth it is getting a little dark because during the original injury the tooth actually bled up into to the part of the tooth you can see and it is this blood that makes it appear darker.  Tooth won't necessarily be lost prematurely but I'd keep an eye at the top of the tooth (the part inside the gum where the root would be) and watch for swelling. If it swells then see a dentist immediately as it can still possibly be saved with what is called a pulpotomy or pulpectomy. the fact that the teeth tightened up is a very good sign.  I am a dentist.

[Caryopteris]

Take her to the dentist.  You should be taking her every six months.  

I'm sorry, but darkening after trauma usually means the tooth is dying.