What is the statute for action against a manufacturer of a toothpaste product for damages?

Sprucing up for an event tried a whitening toothpaste product two months before. It worked. Stopped product use after event. Slowly noticeable staining on some teeth. Dentist asked if I used anything different? I said whitener product. He said he could not remove it using whiting treatments. Hygienist said those products DO that. It is permanent. Dentist would not write letter. I said if this goes to court I might have to subpoena you to testify. He said OK, after that I am not your dentist. Company admitted their product can stain teeth. I suggested small claims amount and they said no, but we will pay to have your teeth re done (costing thousands of dollars). I said so you force customers to consider full mouth treatments rather than pay a damages fee? I also said nothing on box told me my teeth would be stained, permanently and that it couldnt be removed. They acknowledged that and said they werent changing that. I said who would use the product then? Not sure if personal injury and/or product negligence. Especially since company knows about it (and dentists). Rather than debate cause, can you tell me statute for damages? Thank you.