Hi and welcome,
Your question has landed in the MS community but bleeding and swollen gums is very common and typically caused by bacteria not being removed by your oral hygiene routine or technique, often all that's needed are minor changes eg using an anti bacterial mouth wash, replacing your tooth brush every 3 months, changing to a soft bristle tooth brush, brushing more softly, altering your flossing routine, brushing in a circular motion, brush at about a 45 degree angle, eating a low