It is mainly due to deposites of food residuals inbetwen the tooth and marginal gingiva(the gum that surrounds ur teeth)these are basicaly soft and loose in nature so that the deposition plaque occures easily and it is more prone to infection which often shows symptoms like bleeding while brushing,gum pain,sweliing,rendness of gums and pain
Next Steps
full mouth ultrasonic scaling can give u relif from this problem followed by proper medication prescribed by ur dentist (gum paints and mouth washes)
Health Tips
do clean ur teeths once in a year which keeps u away from majority of ur dental problems