Use this when the user asks what a dental procedure costs in a given US state (51 incl. DC), or how a state sits next to the US average, for one of 12 procedures: exam and cleaning, filling, deep cleaning, extraction, root canal, crown, implant, All-on-4, dentures, braces, veneer, whitening. Returns the state cash band (low / average / high), the national band, the gap in percent and the state's Restorative Cost Index, each with its basis (observed or estimated). Phrasings: "how much is a crown in Ohio without insurance", "what do people in Florida pay for a root canal", "¿cuánto cuesta un implante dental en Texas?", "costo de una limpieza dental en California". When the user already has an amount quoted by their dentist and asks whether it is normal, use benchmark_treatment_plan instead: it places the quoted amount against this band line by line. Do not use for: diagnosis, treatment choice, a named insurer's plan price, dentist recommendations, countries other than the US and Canada. Observed market research with a source URL and period on every figure; not a quote, not medical advice.