When my wife and I owned a restaurant back in the late 90s we had a local health inspectator who looked for dented cans in our inventory. He said they were not allowed in a restaurant because of the remote possibility that the seal could be ruptured resulting in spoiled food or even illness. He said it would be a local (county) health dept. infraction with a point deduction on your inspection and could therefore lead to loss of license. Whenever I found a dented can I always returned it to the store or distributor and they never questioned it. At home it's a different story. There I just look to see if it's ruptured or not and make the judgement call.