What does the retention of Nasmyth's membrane in children typically lead to?

The retention of Nasmyth's membrane in children typically leads to green staining on maxillary anterior teeth. Nasmyth's membrane is a thin layer that covers the newly erupted teeth. This membrane often retains bacteria, plaque, and other debris, which can result in a greenish discoloration on the teeth, especially visible on the maxillary anterior teeth due to their prominent position in the mouth.

This discoloration occurs as a result of the interaction between the retained membrane and the normal oral flora. As the child grows and the membrane wears away, the green stains usually diminish or disappear with proper oral hygiene practices. The phenomenon is fairly common in young children and is usually not a cause for concern, but it may require dental cleaning if it persists. The other options involve different staining or complications that are not directly associated with the presence of Nasmyth's membrane.