Pulpdent Activa BioACTIVE – Base/Liner Activa ™ BioACTIVE – Base/Liner ™ by Pulpdent adheres to dentin and does NOT require etching or bonding agents. What makes Activa™ unique is the way it stimulates mineral apatite formation and natural remineralization at the material-tooth inderface (knitting the restoration and tooth together).