Zinc free formula. Extra strong holding power. ADA Accepted: American Dental Association. The ADA council on scientific affairs' acceptance of Effergrip denture adhesive is based on its finding that the product is effective as a temporary measure and may provide increased retention of complete dentures, when used as directed. Ill fitting dentures may impair teeth - consult your dentist as soon as possible. - Council on Scientific Affairs, American Dental Association. Efferdent.com. Questions? 1-877-925-5374. Efferdent.com/Effergrip. Made in Canada.