Many people think cavities occur only on the chewing surfaces of teeth. However, for older adults, one of the biggest threats to oral health is cavities that develop near the gumline or on exposed tooth roots. Often called root cavities or root caries, these lesions can progress quickly, threaten otherwise healthy teeth, and significantly impact quality of life.

Why Seniors Are Especially Vulnerable

As we age, our gums naturally tend to recede, exposing the root surfaces of teeth. Unlike the hard enamel that covers the crown of a tooth, root surfaces are covered by cementum and dentin, which are much softer and more vulnerable to decay. When bacteria interact with sugars in the mouth, acids can attack these exposed surfaces much more rapidly than enamel.^1,5

Researchers have identified root caries as one of the most significant oral health problems affecting older adults. The risk rises because people are keeping their natural teeth longer than previous generations, creating more opportunities for root surfaces to become exposed over time.^1,2

A Common but Often Overlooked Problem

Studies show that root cavities are highly prevalent among older adults. The problem is often underestimated because root cavities can be difficult to see without a professional dental examination. Unlike cavities on the biting surface of a tooth, root decay may develop silently along the gumline until sensitivity, discoloration, or even tooth fracture occurs. ^1,2

The Role of Dry Mouth

One of the biggest contributors to gumline cavities in seniors is dry mouth, also known as xerostomia. Many medications commonly prescribed for high blood pressure, depression, allergies, Parkinson's disease, and other chronic conditions can reduce saliva production.^3,4

Saliva plays a critical protective role by neutralizing acids, washing away food particles, and supplying minerals that help repair early tooth damage. When saliva levels drop, the risk of cavities increases substantially. The American Dental Association notes that reduced saliva flow can increase the likelihood of dental caries, tooth demineralization, and tooth sensitivity.⁴

Warning Signs to Watch For

Root cavities often begin subtly. Seniors should pay attention to:

• Increased sensitivity to cold, heat, or sweets.
• Yellow, brown, or dark areas near the gumline.
• Rough spots on the roots of teeth.
• Food trapping between teeth.
• Changes in the appearance of receding gums.
• Unexplained tooth discomfort.^1,2

Because symptoms may not appear until significant damage has occurred, routine dental examinations remain essential.

The Bottom Line

Cavities near the gums are not a minor dental issue. For seniors, they represent one of the leading threats to maintaining a healthy, functional set of natural teeth. Gum recession, dry mouth, medications, and chronic health conditions all contribute to increased risk. Fortunately, with good oral hygiene, fluoride exposure, management of dry mouth, and regular dental care, many root cavities can be prevented or detected before they cause serious damage.^1,2,5

References

1. Gati D, Vieira AR. Elderly at Greater Risk for Root Caries: A Look at the Multifactorial Risks with Emphasis on Genetics Susceptibility. International Journal of Dentistry. 2011;2011:647168. [pmc.ncbi.nlm.nih.gov]
2. Lipsky MS, Singh T, Zakeri G, Hung M. Oral Health and Older Adults: A Narrative Review. Dentistry Journal. 2024;12(2):30. [mdpi.com]
3. American Dental Association. Aging and Dental Health. Updated August 24, 2023. [ada.org]
4. American Dental Association. Xerostomia (Dry Mouth). Updated March 4, 2026. [ada.org]
5. Nature Index. (n.d.). Root caries prevention and management in older adults. Nature. https://www.nature.com/nature-index/topics/l4/root-caries-prevention-and-management-in-older-adults