Dental crown and Dental bridges are a false tooth that is usually made of porcelain or ceramic. It is always advised that, if the tooth is damaged but still can be used then a crown is a better option in such cases, but if the tooth is missing or grossly decayed tooth is present, it is better to remove the grossly decayed tooth and replace it with the help of a bridge. It's your Dentist who can judge this thing well and advise you the same.