First, you need to try oil pulling. It does wonders for your dental health. Please visit that forum and read the recommended messages. Even if it doesn't make your problem go away, it will still be very good for you. And it will keep dentists from making stupid suggestions, like root canals. You need to read about root canals, it's the last thing you want done, and most of the time very unnecessary.
Second, why are you taking Nexium everyday? You have acid reflux? Have you tried any other the natural cleansings. Both my husband and I were on Tagamet everyday for years until we started cleansing. Any acid is completely gone now.
The Nexium does not cure anything, it just suppresses the symptoms. Don't you want to get rid of this? You need to cleanse.
Is you pain an irritation or a deep pain? Do you think you might be clenching your teeth?