When does my baby start teethingTop Teeth Central incisors (the front teeth): 8 to 12 months . Lateral incisors (the teeth on either side of the front teeth): 9 to 13 months . Canines, or cuspids (the sharp, pointy teeth on either side of the lateral incisors): 16 to 22 months . First molars (the back teeth used to grind food): 13 to 19 months . Second molars (the back teeth that fill in the last gaps): 25 to 33.