Redness, soreness, inflammation of the surrounding gums where the cement is placed on the tooth. It hurts to floss around that tooth. I kept going back to the dentist to complain the soreness, redness and inflammation but they assumed it was a root infection (long story but not relevant to this topic). I was the one who figured this out myself...the dentist had no idea (she was more familiar with other types of allergy such as nickel, etc.). I insisted they switch out to non-Eugenol products but they don't keep them in stock so I had to wait longer to switch out the cement. It took a couple weeks for the gums to return to normal color.