This week’s question comes from Lynette, who showed us how she was able to “catch” her fingernail on the side of a tooth in a groove that had been present for several years.

Notches at the gumline generally occur on the outside (facial) surfaces of teeth. We all have a thick layer of natural ceramic-like coating on our teeth called enamel. This enamel forms a shell that protects the inner layers of the teeth from damage, but it thins out at it reaches the gumline. At this thin edge is a line called the cementoenamel junction. That’s where the crown of the tooth ends and the root begins.

Cementoenamel junction
Cementoenamel junction

If a tooth has not had any damage, it is rare to be able to feel this line that is present all the way around the tooth because it is designed to be just under the surface of the gumline. Over time, though, many factors can cause gums to recede and expose the root. The most common cause of gum recession and notching is tooth stress that may be caused by a poor bite, clenching, or grinding.

Excessive toothbrushing, acid erosion, and even tooth decay can also make the notches more prominent. Because roots are seven times softer than enamel, an “undercut” can form. This is what you may notice as a groove.

Teeth that have notches at the gumline can be painful to cold, sweets, and even fingernails(!), so a sensitive formula toothpaste is often recommended because it has smaller silica grit particles as well as a medicine designed to settle the nerves down. If a notch is so deep that there is a concern for tooth breakage or a cavity, Dr. Rossen will recommend to you that it be filled with a tooth-colored material for strength as well as for a better cosmetic appearance.

To prevent the notches from getting worse, avoid using abrasive toothpaste and hard toothbrushes, keep the gumline areas clean, and wear a nightguard to ease clenching and grinding pressure. Additionally, we will help you monitor any progression with the digital images we periodically take of your mouth so that you can be assured that your teeth are healthy and stable.

Trish moved to The Colony in 1992 after finishing her bachelor’s degree in dental hygiene at Texas Woman’s University, and has been helping Dr. Rossen take care of his patients’ smiles since 1999.

3 Thoughts on “What is This Notch on My Teeth at the Gumline?”

  • While showing his old army dog tags to my daughter, my father asked if we knew what the notch in the dog tag was for. He told us that when a soldier died in combat, the notch was used to hold his jaw open at his teeth. Another soldier would then kick his jaw shut, imbedding the dog tag permanently in his upper teeth and jaw.

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