Caries is the destruction of tooth tissue. It is usually associated with the intake of sugars and acids contained in both food and beverages. They do not usually hurt until it affects the nerve of the tooth.
Oral hygiene habits, inadequate brushing technique, lack of flossing, smoking, etc., favor the proliferation of bacteria in the mouth, which in its initial stages appears as a yellowish or brown film on the teeth, mainly near the teeth. gums and grooves, favoring the appearance of cavities.