Nutrition, inflammation, and the oral-systemic connection: Why carotenoids matter

We all know, to some degree, that nutrition is important for overall health—and that certainly includes oral health. But how much do we really understand about applying nutrition in a clinical setting? Between constantly evolving dietary advice, biohacking trends, and emerging health biomarkers, it can feel overwhelming when the goal is simply to help patients improve their oral health outcomes. As dental professionals, we already manage complex inflammatory disease in the oral cavity every day. Adding nutritional counseling to that conversation can feel like one more responsibility in an already full appointment.

Start with carotenoids

So where do we start? A practical place to begin may be carotenoids. Understanding what carotenoids are and how they influence inflammation and immune response provides a clinically relevant entry point into the broader conversation about nutrition and oral health.

What are carotenoids?

Carotenoids are naturally occurring phytonutrients found in many brightly colored fruits and vegetables such as carrots, tomatoes, leafy greens, bell peppers, and sweet potatoes. Compounds such as beta carotene, lycopene, lutein, and be-cryptoxanthin are widely studied for their antioxidant properties and their role in supporting immune function.¹ These nutrients are fat-soluble pigments that help plants absorb light energy during photosynthesis, but in the human body they serve a very different role: helping regular oxidative stress and the inflammatory process.

Where periodontitis comes in

This becomes particularly relevant in dentistry because periodontal disease is fundamentally an inflammatory condition. While bacterial biofilm initiates the disease process, much of the tissue destruction associated with periodontitis occurs as a result of the host’s inflammatory response. During infection and inflammation, immune cells generate reactive oxygen species (ROS) as part of the body’s defense mechanism. These molecules help neutralize pathogens but when produced in excess they can also damage surrounding tissues, including collagen fibers, cellular membranes, and gingival connective tissue.²

Carotenoids help counteract this process by neutralizing ROS and supporting the body’s antioxidant defenses. By helping regulate oxidative stress, carotenoids may contribute to a more balanced inflammatory response and improved resilience of periodontal tissues. Research has shown that individuals with higher dietary intake of antioxidant-rich foods often demonstrate improved antioxidant capacity and reduced markers of systemic inflammation.¹

Association between antioxidant intake and periodontal outcomes

Some studies have also identified associations between antioxidant intake and periodontal outcomes. In a longitudinal study of older adults, individuals with higher dietary antioxidant consumption demonstrated lower rates of periodontal disease progression over time.³ While diet alone does not determine periodontal disease risk, these findings reinforce the growing understanding that systemic nutritional status can influence periodontal inflammation and tissue response.

Carotenoids also support immune regulation and epithelial integrity. Several carotenoids serve as precursors to vitamin A, which plays a critical role in maintaining healthy epithelial tissues and supporting immune cell signaling. In the oral cavity, the gingival epithelium functions as an important protective barrier against microbial invasion. Adequate nutrient availability supports the body’s ability to maintain this barrier and respond effectively to microbial challenges.

Oral and systemic health

For dental hygienists and preventive-focused clinicians, this connection reinforces an important concept: oral health cannot be separated from systemic health. Nutritional patterns influence inflammatory balance, immune response, and tissue healing—all of which contribute to how patients respond to periodontal challenges.⁴

However, one of the challenges hygienists face when discussing nutrition with patients is that the conversation can be abstract. It's easy to recommend “eat more vegetables” or “make sure to get plenty of antioxidants,” but these suggestions can be difficult for patients to translate into meaningful behavioral change. Without a way to measure progress, nutrition conversations may feel subjective and difficult to track over time.

Connecting lifestyle habits with measurable health outcomes

As health care continues to move toward more personalized and preventive models, clinicians are increasingly looking for ways to connect lifestyle habits with measurable health outcomes. In dentistry, this shift presents an opportunity to expand the role of the dental hygienist beyond traditional mechanical therapy and into broader preventive health education.

Carotenoids offer an ideal entry point into this discussion because they are both nutritionally relevant and measurable. Advances in biomarker technology now allow clinicians to assess carotenoid levels with a simple finger scan, providing a tangible way to evaluate antioxidant levels in the body.

In part two …

In the second part of this series, we will explore how emerging chairside biomarker technology is helping dental professionals translate nutritional science into practical patient education. By measuring carotenoid levels chairside, hygienists can move beyond generalized dietary recommendations and begin incorporating personalized, measurable nutrition conversations into everyday patient care.

References

1. Mayne ST. Beta-carotene, carotenoids, and disease prevention in humans. FASEB J. 1996;10(7):690-701.
2. Chapple ILC, Matthews JB. The role of reactive oxygen and antioxidant species in periodontal tissue destruction. Periodontol 2000. 2007;43(1):160-232. doi:10.1111/j.1600-0757.2006.00178.x
3. Iwasaki M, Moynihan P, Manz MC, et al. Dietary antioxidants and periodontal disease in community-based older Japanese: A 2-year follow-up study. Public Health Nutr. 2013;16(2):330-338. doi:10.1017/S1368980012002637
4. Linden GJ, Herzberg MC, Working Group 4 of the Joint EFP/AAP Workshop. Periodontitis and systemic diseases: a record of discussions of working group 4 of the Joint EFP/AAP Workshop on Periodontitis and Systemic Diseases. J Clin Periodontol. 2013;40(Suppl 14):S20-S23. doi:10.1111/jcpe.12091