Thanks for asking the query,
occurs due to inflammation of gums known as GINGIVITIS, it shows symptoms such as redness, swelling and pain, sensitivity, recession of gums, exposure of root surfaces of tooth.
I would suggest you to visit Dentist
and get the checkup done.
Go for symptomatic treatment of complete mouth scaling and polishing and root planing.
Use antiseptic mouthwash gargles tiwce daily.
Maintain good oral hygiene
, use soft bristle toothbrush and brush teeth twice daily, develop habit of using interdental cleaners and dental floss.
Take a balanced diet, and drink lots of water.
Hope this helps out.