Good nutrition is critical for achieving good oral health as it helps maintain tissue integrity, boost immunity, and prevent infection. Both undernutrition and overnutrition negatively impact oral health by disrupting tissue homeostasis, healing times, and risk for the development of periodontal disease, dental caries, and infective oral disease. Vitamins A, C, D, and B-complex; calcium; phosphorus; magnesium; and omega-3 fatty acids support immune function, healthy bones, collagen production, and oral tissue health. Deficiency in vitamins can result in damaged enamel, periodontal disease, decreased healing time, and a higher risk for developing systemic disease (e.g., cognitive decline and inflammatory diseases). Fluoride protects from cavities while enhancing enamel remineralization. Lastly, dietary modifications and a balanced diet support good nutrition and good oral health, as both have a relationship. A well-balanced diet rich in vital vitamins and minerals can substantially increase oral health, particularly for young individuals, the elderly, and at-risk populations. Public health campaigns should stress nutritional education and dietary adjustments to promote oral and general health.