Caries most frequently occurs in areas of the tooth that are difficult to clean. These are deep recesses, interdental spaces or, above all, at the edge of an old plastic filling. This is because shrinkage of the plastic when the filling hardens creates a microscopic gap into which bacteria can penetrate and cause new caries over time. This is not desirable and is therefore avoided by DR. HAGER | dentists do not offer this in the posterior region. The appropriate solution here is the ceramic inlay.