Psychobiology of Sleep and Oral Health: How Sleeping More Can Shield From Oral Pathologies

By Gabriella Mouris

A recent novel study revealed an interesting finding: sleep and oral health are connected, with sleep restriction associated with changes in oral health (1). The oral systemic link is an emerging area of study linking oral pathologies with a myriad of related bodily functions, including sleep. The pathways of sleep and oral health are related and connected through feedback loops, which are both constantly effected through daily oral and sleep hygiene. When sleep is shortened, fragmented, or disordered, the downstream effects are not confined to mood or attention. They extend to saliva, inflammatory signaling, immune balance, pain sensitivity, and the behaviors that sustain daily oral hygiene. 

​Biologically, the clearest connection of oral health and sleep is inflammation, with sleep disturbances negatively affecting oral health. Sleep loss and sleep fragmentation amplify systemic inflammatory activity, while periodontal disease is itself a chronic inflammatory burden. Recent systemic reviews found that sleep duration of 5 hours or less was associated with increased periodontitis risk and reported that periodontitis was associated with obstructive sleep apnea (OSA) (2, 3). In children, shorter sleep and elevated salivary glucose also predicted worsening gingivitis over time, suggesting that sleep may alter the oral milieu early in life, not only after years of disease accumulation (4). Saliva is the second major connection. The American Dental Association notes that reduced salivary flow raises the risk of caries, demineralization, sensitivity, and oral infection. Additionally, dry mouth often worsens at night because salivary output is physiologically lowest during sleep and can be further aggravated by mouth breathing. That mechanism helps explain why OSA and sleep-disordered breathing matter to dentistry, as repeated mouth breathing can shift the oral environment toward dryness, plaque retention, and risk of caries. A study of adults in the United States, found that each additional hour of sleep was associated with lower odds of caries experience, while sleeping 7 hours or more was associated with a lower adjusted mean ratio for caries burden (5).

The pathway connections also flow from oral health to sleep. Oral pain, gingival inflammation, xerostomia, erosion, and temporomandibular strain can all disturb sleep onset or continuity. In a nationally representative U.S. sample, adults with sleep disorders had higher adjusted odds of oral aches, stress about oral health, and oral-health-related difficulty in work or school (6). Additionally, another study found that in certain adults, very poor sleep quality was associated with markedly worse oral-health-related quality of life (7). Thus oral disease and sleep dysregulation are markedly heavily correlated affecting each other in both directions. 

Clinically, the conclusion is pragmatic as both sleep and oral hygiene issues can be first addressed through practical patient intervention. Dentists should screen for snoring, witnessed apneas, reflux symptoms, dry mouth, morning headaches, and jaw pain; physicians and sleep clinicians should ask about tooth wear, gingival bleeding, oral pain, and hygiene barriers. To personally combat this, an individual should aim for a stable sleep schedule, a cool and quiet bedroom, reduced evening screen exposure, and avoiding late caffeine, alcohol, and heavy meals. To address the oral component, individuals should focus on the basics of oral hygiene including to brush twice daily with fluoride toothpaste for two minutes. Overall, new evidence highlighting the oral systemic link to sleep quality elucidates a clear relation and encourages people to seek evaluation when poor sleep and poor oral health begin to travel together. 

References
1. Lei F, Hu X. Oral health and sleep disorders: A systematic review and meta-analysis. Biomed Rep. 2024 Dec 20;22(3):37. doi: 10.3892/br.2024.1915. PMID: 39781044; PMCID: PMC11704870.
2. Zhou F, Liu Z, Guo Y, Xu H. Association of short sleep with risk of periodontal disease: A meta-analysis and Mendelian randomization study. J Clin Periodontol. 2021 Aug;48(8):1076-1084. doi: 10.1111/jcpe.13483. Epub 2021 Jun 9. PMID: 34109656.
3. Khodadadi N, Khodadadi M, Zamani M. Is periodontitis associated with obstructive sleep apnea? A systematic review and meta-analysis. J Clin Exp Dent. 2022 Apr 1;14(4):e359-e365. doi: 10.4317/jced.59478. PMID: 35419178; PMCID: PMC9000382.
​4. Zhang L, Lin C, Chen Z, Yue L, Yu Q, Hou B, Ling J, Liang J, Wei X, Chen W, Qiu L, Li J, Niu Y, Lin Z, Cheng L, He W, Wang X, Huang D, Huang Z, 5. Niu W, Zhang Q, Zhang C, Yang D, Yu J, Zhao J, Pan Y, Ma J, Deng S, Xie X, Meng X, Yang J, Zhou X, Chen Z. Expert consensus on pulpotomy in the management of mature permanent teeth with pulpitis. Int J Oral Sci. 2025 Jan 7;17(1):4. doi: 10.1038/s41368-024-00333-9. PMID: 39762213; PMCID: PMC11704326.
5. Alawady A, Alharbi A, Alharbi H, Almesbah S, Alshammari N, Alkandari A, Alhazmi H, Alqaderi H. Association between sleep duration and dental caries in a nationally representative U.S. population. BMC Oral Health. 2023 Jul 18;23(1):497. doi: 10.1186/s12903-023-03147-z. PMID: 37464351; PMCID: PMC10354888.
6. Movahed E, Moradi S, Mortezagholi B, Shafiee A, Moltazemi H, Hajishah H, Siahvoshi S, Monfared AB, Amini MJ, Safari F, Bakhtiyari M. Investigating oral health among US adults with sleep disorder: a cross-sectional study. BMC Oral Health. 2023 Dec 13;23(1):996. doi: 10.1186/s12903-023-03686-5. PMID: 38093226; PMCID: PMC10720045.
7. Ju X, Luzzi L, Jamieson LM. Social inequities in general health and oral health among Australian adults over time. BMC Public Health. 2025 Nov 21;25(1):4406. doi: 10.1186/s12889-025-25523-w. PMID: 41272625; PMCID: PMC12754961.