DenFil BulkFlow is a flowable bulk fill restorative resin which allows users to restore the cavity up to 4mm of single increment. It has excellent fracture resistance because of its high flexural strength, and it has low polymerization shrinkage so that it is suitable for blocking the cavity wall. Because of its outstanding flowability, we can expect self-leveling phenomenon on the surface of prepared tooth and one time incrementation up to 4mm can reduce chair time For these reasons, BulkFlow can be applied to not only for children but also adults.