Metal Bowl

Is a metal bowl unhealthy for a dog to eat and drink water out of?
What I really am questioning is the water. Usually the food goes right away but sometimes the water might sit for a while and that is what has me a little worried. Sometimes his breath will smell a little tinny. Anybody have any answers I would appreciate them?
Actually, I prefer stainless steel dishes. Ceramic can crack-leading to bacteria growth; and plastic can crack/swell/ and also be inhabited by bacteria. Plus the plastic can actually cause chin acne and yeast to develop. (unless you buy Anti-Microbial food safe dishes) Just change the water daily, and try making sure it is an actual Pet Dish and you should be fine. 
ADDED: As far as his breath goes, it is most likely the mineral in your tap water rather than the dish itself. (As long as it is a Stainless Steel PET dish)
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