The most common cause of bleeding gums is inflammation. You may notice your gums bleed when you first use a water flosser. This is usually due to gum inflammation and the fact that you are now cleaning areas which will reduce inflammation. The best way to overcome this is to use the soft mode to begin with and gradually increase to the normal and pulse mode. Any discomfort and/or bleeding will disappear as your gum health improves. We recommend seeing your dentist and hygienist regularly to ensure overall good oral health