“Blood thinner” is a broad term that includes anticoagulant and antiplatelet medications. These drugs work in different ways, remain active for different lengths of time, and may be prescribed to prevent different medical problems.
The dental procedure also matters. A filling does not create the same bleeding risk as several surgical extractions. Your care team may consider the medication and dose, why it was prescribed, the expected bleeding, kidney or liver function, other medications, and any history of bleeding or clotting problems.
