Objective: The purpose of this research is to create a halitosis sensor device that can detect periodontal disease through bad breath. Material and Methods:The method used is MQ 136 gas sensor which possesses high sensitivity to H2S gas and can monitor organic vapor including sulfur well. Results: The result of the resistance value obtained in the sensor is changed to the concentration value of the substance and displayed in the LCD. When the power button is switched on then the power supply from the battery is flowing in the Arduino and LCD. When the "result" button is pressed it will appear the desired result on the LCD in the form of H2S element concentration and also predicted the status of periodontal disease suffered by the patient. Conclusion: This halitosis sensor can detect early periodontal disease experienced by a person so that patients with a suspected periodontal disease can be treated as soon as possible.

To investigate the possibility of smart handpiece for controlling dental rotational instruments using the voice command system. Material and Methods: This smart handpiece has a battery that can be used directly using AC 220V power supply. On the handpiece, a sound sensor that can recognize sound is provided. This sound sensor can receive commands to adjust the rotation speed of the handpiece, adjust the water and wind are released by the handpiece. In order for the tool to work properly we use a microcontroller to be able to carry out its functions when the sound sensor receives signals. Next the microcontroller will execute the programmed commands such as the voice command that can turn on the compressor to adjust the motor rotation and water output on the handpiece out its functions when the sound sensor receives signals. Next the microcontroller will execute the programmed commands such as the voice command that can turn on the compressor to adjust the motor rotation and water output on the handpiece. Results: According to our study, the smart handpiece can work well with the voice command system. Conclusion: A novel smart handpieces provides promising prospects for use in dental practice.