With crowns you have to maintain very good oral hygeine to maintain the health of the gums. iI gums are healthy then there is no reason for bone loss. You should brush twice daily with regular flossing. You can do warm saline rinses and can massage the gums with good gum paint. For more information on dental crowns like how to maintain them you can visit the following link.......http://www.identalhub.com/articlecategory-dental-crowns-72.aspx