An invoice that does not match what was discussed in the chair feels wrong in a system this heavily regulated. Dutch dental pricing runs on nationally fixed treatment codes, with written estimates required above certain amounts, so a bill that looks arbitrary usually has a paper trail behind it — or a conspicuously missing one.
Not really, and you have real recourse. Dutch dental tariffs are set by the NZa (Nederlandse Zorgautoriteit), which publishes maximum prices for every treatment code (prestatiecode), so a legitimate bill should map cleanly onto that public list — you can check any invoice against it. As of 2026, for anything estimated to cost more than €250 the practice is legally required to give you a cost estimate (begroting) before starting treatment, itemized by material and technique; above €500 that estimate has to be in writing, not just verbal. If you're billed for something you never agreed to, or the final invoice diverges from the begroting, ask for a gespecificeerde nota — an itemized bill listing each code and price — and query anything unclear with the practice directly first. If that doesn't resolve it, dental practices are required to have a complaints procedure, and unresolved disputes can go to the geschilleninstantie mondzorg. Genuine surprise billing for planned work is uncommon in a system this regulated; what you're describing is more often a missing or vague estimate, or add-on treatments proposed chairside that you technically agreed to verbally without registering the cost. Worth a firm conversation before assuming bad faith.