Research increasingly suggests that oral health may play a role in fertility for both men and women. Chronic gum inflammation (periodontitis) creates a systemic inflammatory burden that may interfere with reproductive hormone balance, ovulation, and even sperm quality.

Studies have found that women with periodontal disease may take longer to conceive, and that treating gum disease may improve certain fertility markers. In men, chronic inflammation and the presence of specific oral pathogens have been associated with reduced sperm motility and quality.

Up to 30% of infertility cases remain "unexplained" after standard evaluation. Researchers have proposed that oral microbial dysbiosis — an imbalance in the oral microbiome — may be a contributing factor that standard fertility workups never assess.

Periodontal bacteria such as Porphyromonas gingivalis (Pg) and Fusobacterium nucleatum (Fn) can enter the bloodstream through inflamed gum tissue. Once circulating, they trigger inflammatory cascades that may affect reproductive organs, disrupt hormonal signaling, and impair cellular function critical to conception.

In women, chronic oral inflammation may elevate C-reactive protein (CRP) and pro-inflammatory cytokines, potentially interfering with implantation. In men, systemic inflammation from oral pathogens has been linked to oxidative stress in seminal fluid, which can damage sperm DNA.

Additionally, certain oral bacteria produce enzymes that may degrade proteins involved in reproductive processes, though this area requires further research.