The high frequency of caries in primary teeth and its inadequate treatment are major public health problems during childhood. In recent times, Hall Technique has become one of the most commonly used method for biological sealing of carious lesions in primary molars. The treatment provided by this technique aims to increase the patient's compliance and operator comfort as the use of local anesthesia is eliminated. In addition to caries sealing, the child will also have a less traumatic dental experience in his/her early life and will probably return for more difficult treatments in the future.