ETA Caries detector dye is a type of dental dye that is used to detect caries, or tooth decay. It is a red dye that is applied to the teeth with a cotton swab or brush. The dye stains carious dentin, which is the inner layer of the tooth that is affected by decay. The dye does not stain healthy dentin.

ETA Caries detector dye is a valuable tool for dentists because it can help them to detect caries early, before it causes any visible damage to the tooth. Early detection of caries allows dentists to treat the decay before it progresses and causes more serious problems, such as cavities and abscesses.