Sensitive Tongue

I had been eating an egg & sausage breakfast sandwich with yellow peppers and mustard every morning at Subway.  My tongue started getting sensitive six months ago and recently, felt irritated all the time.  Even ketchup set it on fire.  I found a dry mouth toothpaste called "biotene" and a mouthwash called "Colgate Peroxyl".  I am in my third day and already am getting results.  The center is returning to its normal color and only the rim (mostly the tip) is still sensitive.