 Hello everyone, in this video I will show you about one of our reset which is photoacoustic imaging of hidden dental caries using visible light to your laser. And also this paper is already accepted in Journal of Appliate Clinical Medical Physics. The background of this study is hidden dental caries which is one of two decade that is difficult to identify throughout face oil diagnosis because teeth with hidden caries is a paranormal on the tooth surface but are damaged underneath. Based on oral health by World Health Organization 2022, it says up to 3.5 billion people worldwide suffer from oral disorder and 2 billion adults have a permanent tooth caries. 520 million children have a primary tooth caries and based on this data we have to investigate for dental imaging and of course there are so many methods for dental imaging but in this research we try to conduct photoacoustic imaging which is PAI, a non-invasive diagnostic imaging technology that is combined optical and ultrasound imaging technique to utilize the photoacoustic effect. The system that we use in this study is based on the visible light with 532 nanometer wavelength as shown in feature one and how to generate the photoacoustic signal is by exposing the laser pulse to the biological tissue or in this case we use the teeth and it can be potentially cause the laser energy absorbed and converted into heat and the absorption is depending of the chromophore endogenous content such as water, hemoglobin and melanin and because of this thermoelastic expansion it will produce the photoacoustic signal and it will record by the condenser microphone and the signal will be imputed to the computer to reconstruct the image. Result of this study is show in feature two which is have a three part, part A or figure A it show two sample, figure B is photoacoustic image display in left view which is the software that we use to control the entire system and figure C is photoacoustic image after processing in the python. Also in figure two show the area of the teeth which is normal teeth it pointed by number one and the careers area pointed by number two the hidden careers area is pointed by number three and the result show the result of acoustic intensity level of each tooth condition show by figure three the average of intensity level for healthy teeth is minus 74.2 plus minus 0.1 decibel and the average of acoustic intensity level for hidden careers teeth is minus 81.2 plus minus 0.5 decibel and the intensity level for the careers area is depending on severity of the careers you can see clearly in figure three in the last part is the conclusion based of the acoustic intensity level measure by the interaction between the laser pulse and the teeth the photoacoustic imaging system in this study can accurately detect the presence of hidden careers and recognize the difference between the careers teeth and healthy teeth this research can be developed into prototypes of a simple device that make it easy to operate in the dental practice so maybe that's all from us thank you so much for watching and don't forget to read the full paper goodbye