1. The cavities
2. The dental pulp disease
3. Periapical disease (acute periapical inflammation, chronic periapical inflammation)
4. The caries tooth hard tissue disease (enamel hypoplasia of teeth, dental fluorosis, tetracycline shaded, congenital syphilis, deformity of the central point, cracked teeth, teeth feel allergy, wedge-shaped defect) marginal gingivitis
