Marrow necrosis that can not be treated with endodontic procedure. 
- Periodontal disease progression leading to severe loose teeth that can not be recovered. 
- False teeth position and teeth function. 
- Cracked or broken teeth that can not be re-created to preserve. 
- Specify the prosthesis 
- Underground teeth when indicated (not all teeth are designated underground extraction) 
- That although 
- Teeth pathological lesions such as tumors that can not be fully treated without extractions. 
- Before removing marrow cancer treatment or radiotherapy serious, any that have a vague prognosis or potential infection, must be removed. 
- Teeth in the fracture zone. 
Number of teeth extracted at each time depending on the position of the teeth, dental status and health of the patient, can spit 2 to 3 teeth 1 times. Do not pull the teeth on either side at the same time because of problems eating.