编者按：口臭，成了许多人社交中的难言之隐，如同一道无形的屏障。口臭者本人往往很难察觉到 自己的异味，正因为难以自知，才让它充满了不确定性和社交压力。口臭有哪些原因造成的呢？哪些生 活习惯容易造成口臭？ 为什么每天刷牙仍难逃异味困扰？是口腔问题还是身体内部在报警？哪些生活 习惯正在悄悄加重口臭？我们又该如何注意和改善口腔异味呢？ ...

Core Points - The article emphasizes the importance of brushing teeth at least twice a day to maintain oral health and prevent dental issues such as cavities and periodontal disease [4][6]. Group 1: Importance of Brushing Twice Daily - Oral health is threatened by two main enemies: cavities and periodontal disease, caused by bacteria that accumulate on teeth [4]. - Bacterial plaque formation occurs in stages, with significant maturation happening within 24 hours, making it crucial to brush at least twice daily to prevent plaque from becoming difficult to remove [5][6]. Group 2: Importance of Nighttime Brushing - Nighttime brushing is particularly important as it helps control the bacterial load on teeth, especially since saliva production decreases during sleep, reducing natural cleaning [9]. - Brushing at night effectively removes food residues accumulated throughout the day, which can feed bacteria and lead to tooth decay [10]. - Nighttime brushing helps eliminate dental plaque, reducing the risk of cavities and periodontal disease [11]. - It also mitigates oral odor caused by bacteria breaking down food residues, which can be more pronounced if brushing is skipped [12].