Teeth Details - Metal on my wolf’s teeth

Initial question: Can I have metal on my Wolf’s teeth?

I had a problem getting him accepted at first because I originally planned to have him have a thin layer of metal on his top two canines. I was told he couldn’t have anything that aided him in battle/made him have more of an advantage in battle. 

Would it be acceptable/ considered an advantage in battle even if the metal wasn’t pointed/sharp but more round and went along with a natural curve of the tooth? Like a really thin sheet of metal just covering it?

Sry I know it was long but I wanted to ask more specifically as to get the correct answer. :)