全麻 means general anesthesia, which is proceeded in hospital with intubation. Child has not any memory about the dental procedures. All dental treatment can be done one time, especially for child who have dental problems in many teeth. It is safe in hospital. The dentist should request medical clearance from your child's pediatrician. The Medical Insurance should cover the cost in hospital. Another anesthesia is IV sedation, which can be done in dental clinic by experienced anesthesiologist. Patient was under deep sedation and unconscious, which means patient did not feel pain and no memory of dental work. All dental work can be done at one appointment. It is safe for healthy children. The last sedation is oral sedation. Child was fed with some liquid medication. Child may feel sleepy, but still conscious, so child can feel pain and may struggle, defiant during treatment. The papoose board was still needed. in your case, if you did not feel comfort about hospital based general anesthesia, you may ask if dentist can do IV sedation or oral sedation. If oral sedation, the treatment may need be divided into 2 or 3 appointment due to limited local anesthesia used and treatment duration.