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40% Etch Gel from DMG-America is a phosphoric acid gel with an easily distinguishable blue color used for etching tooth enamel. The viscosity prevents flow of acid into soft tissue, adjacent teeth, and/or cementum and dentin. It features disposable Luer-lock tips that allow for an accurate, controlled placement and prevents cross contamination. The Luer-lock also prevents the tip from coming off during the procedure. This gel offers a good flow and can be rinsed off easily and cleanly.