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Metal utensils that will be used to handle food that's to be consumed generally need first to be immersed in a mikvah ("toyveled") (if owned by a Jew). If the food or utensil is hot, the utensil must be used only for meat, only for dairy, or neither: not both. Once used hot for meat, it becomes a "meat" utensil, and unusable for dairy; and vice versa.

What is the halachic status of dental instruments owned by a Jew? Do dental instruments need to be toyveled? Can they become meat/dairy if they come into contact with hot portions of food in a patient's mouth?

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1. They aren't for food. 2. How can food in a patient's mouth be hot enough to make them meat/dairy? –  Seth J Jul 5 '13 at 20:15
    
@SethJ 2. doesn't they become hot when you drill? –  jutky Jul 6 '13 at 19:56
    
Why do we care if they became meat or dairy (or treif or chametz etc.)? –  Double AA Jul 6 '13 at 20:00
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@jutky Dentists usually clean the teeth before drilling. No point in filling a cavity if you leave food behind inside! –  Double AA Jul 6 '13 at 20:00
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@DoubleAA I'm not arguing about it, just was asking. –  jutky Jul 7 '13 at 10:16

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