A dental crown is used to cover part of the tooth, protecting it from decay. They’re typically used when the tooth structure is seriously damaged. This can happen due to accidents, damage from fillings, etc. his procedure involves covering the tooth in an shell so it can be protected from further deterioration, and restoring the tooth to healthy function as well. A dental crown can help you prevent the loss of healthy tooth structure due to decay, cracks, chips, or large fillings.