My 4 year old daughter had to get crowns on her 4 front teeth, she was diagnosed with early childhood caries when she was a baby. The last visit that she had at the dentist i mentioned that she had a little white are a above one of the front teeth. Now it has a little bump at the top. I am not sure what this is or why it is happening, can you please give me some insight as to what you think it might be. Also if this is something that might need a root canal or extraction will this harm her permanent teeth?