There are two reasons your tooth may change color after trauma: It’s either trying to protect the nerve or it’s dying. If it’s protecting the nerve, your tooth may look a little darker than the ones next to it. If it changes colors like a bruise (from pink to gray), this means your tooth is most likely dead. You may need a root canal, usually followed by a crown. In some cases it may be necessary to remove the tooth. If it is a baby tooth, you may be able to leave it alone until it falls out.
Canker sores aren’t contagious and usually heal on their own after one or two weeks. Over-the-counter creams and mouthwashes may give you temporary relief. Until it heals, stay away from hot, spicy or acidic foods because these can irritate the sore.
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