Crying and gnashing of teeth, an expression found in the Bible and commented on by different authors in the dental literature, are two organic actions of the human being which should not be avoided or prevented, either by some feeling such as pride or by some physical material or artifact used in the oral rehabilitation of the human being.The feeling of pride can prevent crying, while a physical component implanted in the jaws can prevent the natural dissipation of occlusal forces. The content of the book helps to reflect current dentistry through three analytical pillars: science, philosophy and religion.