国产日产欧美高清一区_日韩人妻系列无码专区久久_在线欧美综合自拍_免费无码又刺激又爽_欧美 国产成人高清亚洲黄片大全_日韩日本系列有码字幕中文字幕_狼友视频黄色网站_惠民福利91麻豆精品国产一区色欲_婷婷五月深爱憿情网六月_污视频精品网站一区

When dentin tubules are exposed to the oral environment, external stimuli (usually cold, hot, sour, sweet) cause abnormal fluid flowing in the dentin tubules which can lead to short-term acute pain and other sensitive symptoms. The product can using through the  glutaraldehyde and protein precipitate in dentin tubule to block the dentin tubules as a result of blocking the transmission of external stimulation and reducing its permeability, so as to obtain dentin desensitization effect.