Neonatal lines are found in all of the following except:
In deciduous teeth and in permanent molars and lower incisors, in which the enamel and dentin are formed partly before and partly after birth, the prenatal and postnatal enamel and dentin, are separated by the neonatal line or ring.
Note:
According to some authors, neonatal line is not seen in permanent lower incisors.
Enamel of primary incisors
Enamel of permanent canines
Enamel and dentin of permanent first molars
Dentin of permanent mandibular incisors