在研磨过程中,经常需用多种粒度的研磨粉(砂)。这些研磨粉用盒子装,很容易弄脏,尤其细粒度粉则更难避免,倘使尘埃等物混入里边,就会影响使用。后来,我们把研磨膏调成糊状并装入空牙膏皮内,将尾部封好后,即可使用。这样,既不会弄脏,又方便使用, In the grinding process, often use multiple sizes of grinding powder (sand). These powders are packed in boxes and easily soiled. In particular, fine-grained powders are harder to avoid. If dust or the like is mixed in, it can affect use. Later, we put the cream into a paste and paste into the empty toothpaste skin, the tail sealed, you can use. In this way, neither dirty nor easy to use,