I am licensed in Nevada, but this answer should apply in New York as well.
Fortunately, your damages are limited to nearly breaking your tooth. That being the case, it would be hard to justify seeking legal counsel for this incident. This kind of case would be difficult, and expensive, to prove. First, you would have to prove that the object was in the can when it left the factory. Second, you have to prove your damages. Since you do not appear to have any physical damages, your damages would be limited to emotional damages such as fear. You should contact an attorney to discuss whether or not a person can be compensated for emotional distress without physical injury in a case such as yours.
Well, the presence of the piece of metal in your can of food obviously indicates negligence. The question here is whether you have sustained actual damages. Are you in pain? Did your tooth chip? If all that occurred was a bit of surprise, you probably don't have much of a case because you have nothing to be compensated for. If you were actually injured, I would advise contacting an attorney in your area to see about filing a claim.
Disclaimer: This answer does not constitute legal advice. I am admitted in the state of California only and make no attempt to opine on matters of law that are not relevant to that state. This advice is based on general principles of law that may or may not relate to your specific situation. You should not rely on this advice alone and nothing in these communications creates an attorney client relationship.
Yes, you may. Fortunately, you weren't injured. So, practically speaking, a suit would not make sense. You should consider taking photos, preserving all evidence, speaking with an attorney, and reporting the incident to the Board of Health. Good luck.
In every case in New York, the plaintiff must prove liability first. After proving liability, the plaintiff must prove damages. These are distinct parts of a case, and, in most instances of trial in New York City, the two issues of liability and damages are "bifurcated." That is, the trial on liability is held and completed, then a separate trial is held on damages.
Here, it appears your liability would be relatively easy to prove. Damages here are, however, little to none. Since your only injury seems to be that biting on the metal upset you, your case is likely too low to pursue a case using an attorney.
Perhaps you should contact the company and see if they are willing to settle. It can't hurt to try.
Good Luck. If you have further questions or need additional information, feel free to contact me at 718-720-7000 and ask for Guy.
[In accordance with the Avvo community guidelines, this communication does not constitute "legal advice", nor does it form an attorney-client relationship.]