Get API credentials from OpenDental β usually an API key or OAuth client from your account or your IT team.
In Retell, open your agent and go to Functions β Add custom function.
Enter the endpoint URL and method, and add your credentials as headers.
Define the parameters the agent should collect from the caller and pass through.
Write the description that tells the agent when to call the function β this is what the model uses to decide.
Test it in the LLM playground, check the response parses, then publish.
Inbound call β agent looks up the patient by phone β offers the next open slot β books it and confirms
Open Dental's API is self-hosted, so the endpoint and credentials come from your own practice server.












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