Use is very simple: the needle is introduced into the gingival sulcus along the mesial or distal surface tooth until the alveolar bone crest is contacted.We recommend to inject very slowly, approx. 5-10 sec. per “click” with a non-excessive but constant pressure giving the analgesic solution the time to diffuse into the spongis bone. Contra-indications are for deep periodontal pockets and acute infections.