Hello and thank you for your question.
Based on what you described chances are you either have imbedding a piece of debris under the gums, you have severe gingivitis
or you are flossing improperly.
For debris, see below for proper flossing
Severe gingivitis is inflammation of the gums. This can be to the point that when you floss you actually break and tear apart the tissue. This however will pass with time when you floss daily. Generally two weeks of flossing 1-2 times a day you will notice that the tissue will turn more pink, shrink, tighten up and discontinue to bleed.
For proper flossing: hold the floss around your teeth in a C shape and rub up and down on the side of the tooth 4-6 times. Then floss the other side of the tooth in the same fashion, so you floss both teeth that are touching each other. DO NOT SAW BACK AND FORTH. This will cut the tissue, cause injury
and not remove the plaque
, food and bacteria correctly.
If your gingiva
doesn't improve within a week, go to a dentist
to inspect the area. Swish with Listerine
once daily and do not rinse your mouth out with water, let the residue sit on your gums for about a half hour.
Best wishes and good health