I went to the dentist and was told I needed a root canal. This was 6 months ago. I have no insurance so I can't afford it. I was in a lot of pain for about a month and then it went away. My tooth is a bit discolored now... Whiter than my other teeth. and if I touch the area above the tooth next to my nose, it doesn't hurt really, but I feel a pressure. Am I infected?