What is the consequence of not making cavities retentive?

When cavities are not made retentive, the primary consequence is that the filling may come out. Retentive cavities have features that help hold the filling material securely in place, ensuring that it bonds effectively to the walls of the cavity. If the cavity is not designed to be retentive, the filling lacks the structural support needed to resist forces like chewing and grinding, which can result in displacement or loss of the filling over time.

This issue is significant because a lost filling can lead to more extensive problems such as further decay in the tooth, potential infection, and may ultimately require more complex dental treatment. While other concerns such as pulpitis, encouraging decay, or needing additional cosmetic work can stem from improper fillings or cavities, the immediate and direct consequence of a non-retentive cavity is the increased risk of the filling dislodging.