A polymer that improves polish adhesion and strength, tosylamide/formaldehyde resin (TSF resin) is slowly being phased out due to public image. Concern over formaldehyde has placed a spotlight on TSF resin. Many people see the “formaldehyde” in TSF resin and think it is a variant of formaldehyde. But TSF resin is a completely different chemical compound that looks and functions differently than formaldehyde.