Injection errors: The injection of injected material from the vein not to enter the needle head injected whole vein and the appearance of abscess prolonged treatment

In most cases, injection errors occur if the number of patients exceeds one hundred. Therefore, the error is acceptable. The error begins when the injection material is discharged from the vein so that the injected needle head is not fully inserted into the vein. This results in abscesses that prolong treatment and cause problems for the patient.
The experienced doctor can feel whether the tooth is all intravenous or only part of the vein that has entered the vein and may result in this trivial error to the abscess may end amputation of the patient's arm.