Pregnancy is a complex physiological state characterized by a series of intricate changes across the physiological, immunological, and endocrine systems that are critical for successful fetal development. However, these profound modifications also increase the mother’s susceptibility to a variety of systemic and oral health conditions. This chapter explores the nuanced relationships between systemic health issues, such as gestational diabetes mellitus, and periodontal disease, with a particular emphasis on periodontitis, which is recognized as a chronic inflammatory condition that exacerbates systemic inflammatory responses during pregnancy. The oral microbiota undergoes significant alterations due to the hormonal shifts and immunological adjustments that occur during gestation. These changes can disrupt the balance of microbial communities, potentially leading to periodontal disease, which has been linked to a range of adverse maternal and neonatal outcomes. In conjunction with the physiological changes associated with pregnancy, such as endothelial dysfunction and elevated levels of pro-inflammatory cytokines, the risk of cardiovascular, metabolic, and infectious complications is markedly increased. Notably, periodontitis is a contributing factor to systemic health issues that negatively influence maternal and neonatal health. For instance, periodontitis has been associated with adverse events such as low birth weight, preterm delivery, and fetal growth restriction. By examining these interconnections, this chapter provides a comprehensive understanding of the implications of periodontal health on maternal and fetal well-being, elucidating the underlying mechanisms that may contribute to adverse pregnancy outcomes. Through this lens, clinicians and healthcare providers can develop more effective strategies to mitigate risks associated with pregnancy-related complications.