I can't stop chewing the inside of my mouth and i have peridontal disease is this dangerous with heart disease the cause if my dads death?

Multiple issues: First if your dad died of a heart attack at a young. Age then your at risk regardless of your gums. You need to make sure you follow up for regular physicals with complete labs. Follow a healthy life syle and exercise regularly. Your teeth and gums should be evaluated by your dentist. There has been an association with CAD and gingivitis so getting this taken care is a good idea.

Periodontal disease: Periodontal disease should not be taken lightly. New studies have indicated increased problems with many vital organs, including your heart. Have it treated. You are young and you need a healthy mouth to live a healthy life.