thanks for asking your query
improper flossing technique leads to injury
of of gums,which cause pain,bleeding and discomfort
first you have to learn te proper flossing technique
1.Use a piece of dental floss which is approximately 20-25 cm long. Tie both ends to make a loop. Use the thumbs and the forefingers of both hands to hold the floss, leaving about 2 cm of floss in between
2.Use a sawing motion to slide the floss into the interdental space.
3.Wrap around one tooth making a "C" shape and gently pull down to the deepest part of the gingival sulcus, and then slide it up and down against the tooth. Then wrap around the adjacent tooth and repeat the up and down motions.
4.Clean all the other adjacent tooth surfaces in the same way.
for a trauma caused by flossing apply soothing gel like somogel or bonjela twice a day
gargle with saline water
maintain good oral hygiene
hope this will help