将牙刷刷毛与牙齿表面成45度角斜放并轻压在牙齿和牙龈的交界处,用英语怎么说
问题描述：
将牙刷刷毛与牙齿表面成45度角斜放并轻压在牙齿和牙龈的交界处,用英语怎么说
答
keep 45 degree angle between toothbrush and teeth surface and press the part between teeth and gum softly