Hello,
The reason behind the bleeding is food debris that got entrapped in it and causing inflammation. A thorough cleaning needs to be done to stop it.
For now use soft bristle brush twice a day.
Visit your dentist and get a scaling done further the doctor will tell you about your brushing technique do follow that.
Next Steps
warm saline rinse 4 times a day
Health Tips
cleaning twice a year with 6 month gap is recommended