When I was 5 years old I received a lash to the mouth with a hard object. I realized that my teeth were shaky and they were my permanent teeth so I forced them firmly into the gum. They had set-in after a while . Years later in secondary school they turned yellow and began to hurt me really bad, I even had a swelling inside my mouth across the gum (the two front bottom teeth). It would ache like something was gnawing at the gum and would stop but come back either a few months later or maybe a year later. I was told that it was an infected nerve and needed root canal done.