Individuals who have scleroderma usually Never make common amounts of saliva, so the risk of dental decay will increase more. Veins carry blood again to the heart once the oxygen is taken off. Once the vein is blocked, blood backs up while in the intestines, creating swelling and bleeding. Heart. https://www.sgvascularctr.com/treatments-for-gangrene-insights-from-a-vascular-surgeon/