The dangers of dental caries include: causing the cavity to grow larger and larger, causing inflammation of the nerve of the tooth, and affecting the normal life of the patient. Dental caries is usually not very serious when it has not damaged the deep dentin layer, and vice versa is more serious. Dental caries refers to the destruction of the hard tissues of the teeth, at first, the surface of the teeth have a lusterless white plaque or dark brown, if not timely treatment, the plaque will form cavities, cold, hot, sweet, acid sensitivity, while the cavity will get bigger and bigger, causing inflammation of the dental nerve, the emergence of endodontic, apical periapical inflammation, and other diseases, affecting the patient’s normal work and life. If caries damage is limited to the enamel or dentin superficial layer, this is not serious, you can fill the teeth to restore the shape of the tooth, restore the bite function. If caries and damage to the deeper layers of dentin, this is more serious and may require treatment through root canal therapy or extraction. Dental caries should be timely to the hospital, under the guidance of the doctor for treatment, so as not to delay the condition.