The Types segment classifies Tooth Etching Gel by chemical formulation and functional characteristics, chiefly phosphoric‑acid based gels, self‑etching primers, and nano‑hydroxyapatite enhanced gels. Phosphoric‑acid gels remain the dominant formulation, valued for their predictable etching depth and compatibility with a wide range of adhesive systems, thereby supporting the majority of orthodontic and restorative applications. Self‑etching primers, which combine etchant and primer in a single step, are gaining traction in fast‑track clinical workflows, especially within cosmetic dentistry, where reduced chair‑time is prized. Nano‑hydroxyapatite enhanced gels, a newer entrant, aim to mitigate enamel demineralization while providing adequate surface roughness, appealing to preventive‑oriented practitioners. Each type contributes uniquely to market dynamics, influencing product development, pricing strategies, and adoption rates across the application spectrum, and together they constitute a comprehensive view of the market taxonomy for Tooth Etching Gel.