Stephie you worry too much - you will do fine. My dentist told me people worry more than they need to. Remember your tooth is dead, so the procedure shouldn't be too painful.
I had a root canal a few months ago after cracking my tooth on a popcorn seed (I know one of the deadly foods we shouldn't eat! )and my gum was sore afterwards.
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Re: Root Canal tomorrow morning
)and my gum was sore afterwards. 
