Hi! Welcome to Healthcaremagic. I read your query. Did you get RCT done on tooth before crown? Your corelates with dental or gum infection with pus spreading to facial spaces. This is an emergency situation. I suggest you to visit a dentist immediately. He will take x-ray and remove the crown if required. The drainage of abcess may require RCT or extraction of affected tooth as per the condition of tooth and bone. You need to take a course of antibiotics and antiinflammatories as per your dentist s prescription. Do repeated warm saline rinses if it does not hurt. Avoid acidic or spicy food and beverages. Avoid chewing from the affected side for time being. Hope the answer helps you. Thank you!