Digital Anesthesia In today’s technology, digital needles are being used instead of dental needles. Biggest difference differentiating the system named as digital anesthesia or digital needles from the system with old type of needles is that they don’t cause any pain. Digital needles inject anesthetic substances as per the tissue pressure of individuals. Therefore, feeling of pressure is less with digital needles and patients don’t feel any pain. Anesthetic material used is the same.