You have gum infection which is called as gingivitis. Get your teeth cleaned by a dentist. Follow their oral hygiene instructions.
Next Steps
Get your mouth checked by a dentist.
Health Tips
Most commonly, gingivitis is the result of plaque buildup on the teeth around the gum line. Without adequate removal, the plaque hardens to become tartar, which worsens gingivitis and can, over time, lead to receding gums and even damage the bones of the jaws.