Corticosteroids are hormones produced by the adrenal cortex that have wide-ranging effects throughout the body. They are commonly used in dentistry to treat conditions involving inflammation, such as oral ulcers, lichen planus, and gingivitis. Topical and oral corticosteroids are available in various forms and strengths. While generally safe when used appropriately, corticosteroids can cause adverse effects with long-term use such as increased risk of infection, high blood pressure, osteoporosis, and weight gain. They should be used cautiously in patients with conditions like diabetes, peptic ulcers, or fungal infections.