I like to think of myself as the Goldilocks of sensitive teeth. Sometime after the birth of my first daughter, my teeth got very sensitive. Tea was too hot, ice cream was too cold. It got to the point where I had to wait for my drinks to come to room temperature before I could even start drinking them, and many foods simply became no-go zones. If it was cold, hot or too sweet, it just wasn't worth it. What a pain, literally. For a little bit, I thought maybe I had developed a cavity but a …