Answer:
I mean goodbye for South Americans.
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
Long and thin red within with a nail at the end.
I have three feet but no arms or legs
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
I am a animal that is cute but dangerous, what am I?