Strengthen Base 5Free Nail Polish. Helps fill in streaks for a 100% smooth finish, rich in Vitamin E. Increases the life of nail polish. Does not contain the following 5 harmful ingredients: Formaldehyde, Toluene, Dibutyl Phthalate (DBP), Formaldehyde Resins, Camphor. The nail is thus more cared for, less damaged and consequently less brittle and healthier.