Lines on back tooth
I have two lines on the back of my right molar. I recently went to my dentist (in March of this year) and there were no lines on my teeth. Suddenly, as if over night I now have these lines. Are they cavities? Should I be concerned? I brush my teeth twice a day, floss once every day and use mouthwash morning and night. I have no pain in my mouth, do not drink coffee, tea or sugary beverages. I do drink wine occasionally and the odd muffin here and there. Any information would be helpful. Thank you.