Because you don’t floss often enough or properly. Most people struggle with both. Optimal flossing would be morning and night with string floss (stay away from floss picks) or other implements if you can’t use string for some reason (dexterity, deep recession). The floss shouldn’t go straight up and down but should match the shape of the teeth with a back-and-forth motion as they go snugly into the gum. This will bring your gum infection to a manageable level that allows your gums to be more robust and healthy and the bleeding will stop completely.
Assuming you brush often enough and properly.
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