Etch-All Etching Gel Kit is a milder acid etching gel for dentin and enamel. Etch-All is a non silica, thixotropic phosphoric acid etch gel which stays in place and will not run onto exposed tissue. Dispensed from a syringe through pre-bent small gauge needles, it offers precise placement of gel even in relatively inaccessible areas. Etch-All washes off easily with water.