To realise a good child's dentistry, an excellent analgesia is primordial. Local anaesthesia is most useful for reliable and complete dental care on one tooth during one single appointment. But the young patient is afraid by the "ting", making an association with disagreeable or sore souvenirs as a vaccination. First contact with the dentist is the very important; from psychological point of view, situation has to be dedramatized; from technical point of view, anaesthesia has to be not painful and efficacious. In pedodontics, the best technical procedure is an infiltration anaesthesia.