1 The gum disease of gingivitis is an infection that occurs when bacteria invade soft tissues and bone adjacent to teeth. 2  The severity of this infection varies from mild to severe and can be an indication of a life-threatening systemic disease.
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up vote 2 down vote. APK (Android Package) file is a file format which is created by Google. This format is one of the group members of Executable Files (similar to EXE, MST, AIR). APK file extension is in the Open Handset Alliance which is a mobile phone platform based on Linux. This file extension is especially created when using Google's Android SDK.