The invention is directed to manufacturing and testing methods of electronic intraoral devices for diagnose, monitor and treat local and systemic diseases and conditions for humans and animals. More specifically, the current invention deals with manufacturing techniques, testing methods and a testing apparatus of mainly three types of intra-oral devices: (a) electro-stimulators for various applications such as treatment of dry mouth by stimulating saliva secretion, apnea, sleeping disorders, eating disorders (obesity, anorexia, etc.) dysphagia and others, (b) drug delivery devices; and (c) bio-sensing and monitoring devices. The common parts or the devices are: (1) art electronic module embedded in the device: (2) or a power source being embedded in the device; (3) the devices (or part of them) being placed in the oral cavity.