It’s never advisable to put anything in your mouth you are not 100% sure is CLEAN and/or EDIBLE. Also, holding any type of guitar pick in the mouth presents a potential choking risk. That being said, FIRST make sure you know where your hands have been!
The metal used in ROCK HARD Picks is stainless steel, the same metal used for dental braces, so it is safe to be in the mouth. The DLC coating applied to the outside surface has been approved by the FDA for coatings on orthopedic implants and for food handling surfaces, so it presents no danger to the human body.