Involvement of cavities on the biting surfaces of teeth, such as:
1. Pits, fissures, buccal and lingual surfaces of premolars and molars.
2. Lingual surfaces of front teeth.
![types of cavities - class 1 cavity](https://www.regainteeth.com/wp-content/uploads/2022/09/class-1-cavity.jpg)
Involvement of cavities on the mesial and distal surfaces of back teeth.
![types of cavities - class 2 cavity](https://www.regainteeth.com/wp-content/uploads/2022/09/class-2-cavity.jpg)
Involvement of cavities on the mesial and distal surfaces of front teeth.
![types of cavities - class 3 cavity](https://www.regainteeth.com/wp-content/uploads/2022/09/class-3-cavity.jpg)
Involvement of cavities on the front teeth's mesial, distal surfaces and incisal edges.
![types of cavities - class 4 cavity](https://www.regainteeth.com/wp-content/uploads/2022/09/class-4-cavity.jpg)
Involvement of cavities in the cervical areas of incisors, canines, premolars, and molars.
![types of cavities - class 5 cavity](https://www.regainteeth.com/wp-content/uploads/2022/09/class-5-cavity.jpg)