My son was brushing his teeth when I notice that his gums were bleeding a little. I looked at his teeth and his gums seem a little red. He was just at the dentist about four months ago with a clean bill of dental health. I am worried about him having gum disease since I never notice before that his gums where bleeding when he brush. However, he also could be brushing to hard causing his gums to bleed. How can I tell the difference?