Conscious sedation or sedo-analgesia is a pharmacologically induced relaxation technique performed by an anesthetist. It is an effective and safe technique that acts in a few minutes, bringing the patient into a state of repose, while being alert. The patient is monitored for the entire treatment duration; it is perfect for all types of treatments and is recommended for invasive surgery. Sedo-analgesia is a treatment used to relax, calm down and to tranquilize by acting on the emotional components generated by anxiety and fear. It is an excellent technique especially for children and is obtained by breathing a mixture of oxygen and nitrous oxide, supplied by a special device. It removes anxiety, fear, stress, discomfort, shame, impatience, nervousness, and uninhibits raising the pain threshold. Furthermore it helps in having no perception of the passage of time and induces a psychophysical feeling of wellness, leaving a positive memory.