N-Etch Is An Etching Gel Containing 37% Phosphoric Acid. N-Etch Is Used For Enamel Etching And Dentin Conditioning In Conjunction With Composite Restorations, Sealants And The Adhesive Luting Of Indirect All-Ceramic Or Composite Restorations. N-Etch Is The Best Partner For Tetric N-Bond For Enamel Etching And Dentin Conditioning. Indications N-Etch is a gel used for enamel etching and dentin conditioning in conjunction with adhesives, composites, luting materials and fissure sealants. Composition N-Etch contains phosphoric acid (37 wt.% in water), thickeners and pigments.