Your saliva creates an electrical current for the two metals to react. It gives you a small zap of pain which is known as a galvanic shock.
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Dental Galvanism, Galvanic Shock and your Teeth
Aluminium Foil Can Give You a Galvanic Shock in Your Mouth
Why does aluminum foil feel like electricity on my teeth? - Quora
What Is Galvanic Shock?, River Ranch Dental
SOLVED: The Pain of Dental Voltaic Cell: Have you ever felt a jolt of pain when biting down with a filled tooth on a scrap of foil left on a piece of
Galvanized Shock: Some Dental Patients Can Still Experience a Shocker - Today's RDH
Oral galvanism related to dental implants, Maxillofacial Plastic and Reconstructive Surgery
Be Aware of Possible 'Galvanic Toxicity' Occurring in Your Mouth