Help me plz I have a braces question! (wil be giving 10 points)?

About a year and a half ago I got braces not cuz my teeth were crooked but cuz I hVe no canine teeth so they need to pull all my teeth over. Anyways I got one of my canine teeth pulled (I had baby canine teeth but not grownup pair so it had to be pulled) today I took out the pulled tooth from like 2 years ago and I compared it to my teeth and it looked so white and clean and my teeth next to it looked yellow! Why is that? I brush my teeth twice a day what can I do about it? It's rlly starting to bug me I thought my teeth weren't that yellow I thought they were white but next to the old pulled tooth it looked yellow! So what do I do about it? And how did the color change?? Btw I'm 13 years old and imma girl.