Pregnancy causes a vast array of hormonal changes in your body, and those changes can extend to your mouth. About 50% of pregnant women experience bleeding gums caused by pregnancy gingivitis—because the hormones make your gums more sensitive to bacteria. Another condition you might experience is a pyogenic granuloma, also called a pregnancy tumor. This is a benign mass that can grow on your gums. While it typically disappears once you give birth, you can also have it removed if it causes discomfort or difficulty. Other hormonal changes can cause a gum overgrowth (called an epulis), loose teeth, and increased risk of tooth decay along the gum line.