hi katie
thanks for asking your query
swollen gums is due to multiple reasons like poor
oral hygiene,crowded teeth leading to palque accumulation,
vitamin C deficiency,any medication,irritation,inflamation,any infection,gastric disease...
you can improve your swollen gums by eating a healthy balanced diet.
maintain very good oral hygiene,brush twice a day and floss regularly
gargle with saline water
use antiseptic mouthwash
take vitamin and iron supplements
de-
stress yourself,because high level of stress impact hormones which cause swollen gums
avoid tobacco and extreme foods/beverages
hope this will help
thanks