K-ETCHANT GEL is a thixotropic etching gel (40% phosphoric acid) which is used to etch tooth enamel, dentin, ceramics, hybrid ceramics and cured composites for restorations. The products has a special feature: when you shake the bottle, the contents become liquid, simplifying the application of K-ETCHANT GEL. When it comes into contact with oxygen, it reverts to the gel state, ensuring that only those areas which are supposed to be treated are etched.