It's a buccal pit smooth cavity No pain until deep cavity and pulp intervention.

Hello These r buccal pit carries. Kindly visit the nearby dentist for filling.

Its carious lesion (Cavity), even if you do not experience any pain currently you should visit your dentist

Hello It is a buccal pit cavity Please visit the dentist for the filling

From the image, it appears to be a deep groove or natural fissure of the tooth. Since it has been present for 4 months, with no pain and no visible change, it is likely a normal anatomical groove or a mild fissure stain rather than a progressing cavity. If there is no sensitivity, food lodgement, or pain, it is usually not serious. However, a clinical examination can confirm whether it is only a stain or an early cavity that may need a small filling.

Hello These are buccal pit caries. Kindly get it restored with cement filling.

Smooth surface caries are closure to dental pulp and may infect that.