They are indeed, let's find out why.
Teeth are made up of three basic parts: enamel, dentin, and pulp. The top part of the tooth, called the crown, is the only part of the tooth you should be able to see and consists of a thick outer layer of enamel with dentin underneath.
Enamel is mostly made up of calcium phosphate, a naturally white, rock-hard mineral. Tooth enamel is the hardest substance in the human body and should last a lifetime. However, the outer layer of enamel can become damaged or worn down, particularly if you eat a lot of sugary foods. If the enamel layer becomes thin, the underlying dentin, which is darker and more yellow, will mean your teeth appear yellower.
As we age, our enamel will naturally become thinner. This is unavoidable, but taking good care of your teeth through a consistent oral care routine, and by making the right food and drink choices will help to slow this ageing process.
By looking after your enamel you'll be helping keep your teeth their natural white colour for longer.