When people check their smiles in the mirror each morning, one of the biggest things that they think about is the color of their teeth. It’s natural; there are quite a few reasons that you can start to see your teeth become a little more yellow than you’d like.

Teeth whitening can make a massive difference in the color of your smile, but so can understanding the risk factors that lead to yellow teeth in the first place. If you’re curious, here are a few examples.