Korea and Japan are the countries with more than 30% of the population aged 60 or over in 2019, and Korea is progressing its aging speed faster than Japan. Oral healthcare in the elderly is a fundamental component of the whole health and has a significant impact on the quality of life. Accordingly, there is an urgent interest and effort for improving oral healthcare and improving the quality of life for the elderly. Due to the lack of economic power and low education levels, the number of dental visits by the elderly has dropped significantly. Therefore, developing an application for oral healthcare for the elderly not only helps to keep oral healthcare on their own but also prevents dementia, thus reducing the social cost of dementia. This mobile application is based on the findings that it can activate the cognitivebehavioural function, prevent dementia, or slow the progression of dementia by strengthening chewing function and oral muscle function exercise of the elderly. This application is composed of a content utilization module and oral healthcare diagnostic module and used Android Jellybean 4.1, Android SDK, Cordova, Materialize CSS, Sublime Editor, Windows 10 for mobile application development.

The number of elderly people in Korea is rapidly increasing to advance an aging society. Dementia causes many problems in the aging society but older people usually do not receive effective dementia prevention services because of their low economic power. For the elderly who are experiencing low dental clinic visits due to lack of economic power and education, various services have been developed through the web to help prevent oral healthcare and dementia of the elderly, and a web system has been developed to help oral healthcare and dementia of the elderly. This web system was developed based on the research result that if activating cognitive-behavioral function by strengthening chewing function and oral muscle function exercise of elderly people can prevent dementia or slow dementia progression and it is composed of content utilization module and oral healthcare diagnosis module. PHP 7.1.6, CSS, Notepad++, Bootstrap, Filezilla, and others were used to develop the web system. XAMPP 3.2.2, PHP 7.1.6, Apache2.4.25, and Mysqlnd 5.0.12 were used to build the server for the content service. In the long run, this development will reduce the social costs that government offices use to prevent dementia and to treat and maintain oral healthcare