Your skin is designed to protect your body -- and your teeth have a protective covering, too! Tooth enamel is a thin, tough coating that covers the crown of your tooth. The hardest tissue in the human body, tooth enamel protects your teeth from everyday wear and tear, including chewing, biting and grinding. Tooth enamel also protects underlying dentin from sensitivity and the plaque bacteria that cause cavities.
Tooth enamel is the part of the tooth you see, but it's not what determines its color. While tooth enamel may appear white, it is actually translucent -- and easily stainable! But preventing tooth discoloration isn't the only reason you should practice good oral hygiene. Tooth enamel is usually the first place that a dental cavity forms. Once tooth decay penetrates the enamel, it can travel quickly through the softer layers of your tooth until it reaches the tooth's nerves, resulting in a root canal infection. Protecting your enamel against tooth decay can help it do its job of protecting your teeth!
Why So Sensitive?
Dentin, a bone-like substance that makes up the majority of your tooth, is responsible for your tooth's color and structure. So why bother with tooth enamel at all? Dentin contains tiny tubules that connect the tooth's surface to its nerves, which causes sensitivity when it comes in contact with hot or cold substances. Tooth enamel blocks irritants from entering your dentin and signaling the nerves. It's important to note that tooth enamel does not extend below the gum line and does not protect roots that are exposed from receding gums -- which is why many people who suffer from gum disease are prone to tooth sensitivity.
Coming Out of Your Shell
You need to take care of your tooth enamel -- or you risk losing it! Tooth erosion, or enamel erosion, is the wearing away of tooth enamel. Tooth erosion is usually caused by consuming acidic foods and drinks on an ongoing basis and it's a common problem among soda, wine and coffee drinkers. Enamel erosion can also result from aging, bruxism, dry mouth, acid reflux disease, bulimia or certain medications. The following symptoms could be a sign that you have tooth erosion:
- Sensitivity to hot or cold
- Tooth discoloration due to the exposure of dentin
- Cracks or chips in teeth
- Teeth that are rounded or transparent in appearance
Dents on the surface of your teeth, known as "cupping"
A tooth filling that appears "raised"