You're not alone if you have yellow teeth. Many suffer with this issue. While some people are born with teeth which are more yellow than others, teeth can also become yellow over time. This can be due to a variety of causes, including the following: Drinking and eating certain foods http://pandora.nla.gov.au/external.html?link=https://www.getteethwhitener.com/category/twk01/page/4/