You may have to get teeth cleaning and polishing done as there is deposit on the teeth. Any irritant on the gum will cause bleeding. Deposit is hard and may cause injury to gums kindly get it cleaned and polished by dentist .and along with that you may use chlohex plus mouthwash rinse two times daily for 15 days.
It is better to consult and take proper treatment. Till then do these.
Go to a dentist and get scaling of the teeth.
Use homoeopathic toothpaste Heclalava.
Massage your gums with turmeric ans salt twice daily.
Take a multivitamin tablet.
Good evening! Brush your teeth with Oral-B UltraSoft Tooth Brush in circular motion without applying much pressure. Use Cleanodent mouth wash and brush twice a day. If still not clean it can Be Cured By Bleaching or scaling done bye dentist. Go For That.