"구강 내" refers to the area inside the mouth, which includes the lips, cheeks, gums, tongue, and the roof and floor of the mouth. This region plays a crucial role in various functions such as eating, speaking, and breathing. It is also home to many important structures, including teeth and salivary glands, which aid in digestion and oral health. Maintaining good hygiene in the 구강 내 is essential for preventing dental issues like cavities and gum disease. Regular brushing and flossing, along with routine visits to a 치과 의사 (dentist), help ensure that the mouth remains healthy. Proper care can also prevent bad breath and other oral health problems.