Toothpaste 2

彼女にも6本の歯が生えてきて、笑うたびに悪ガキの様な笑みになってきた。

She also had six teeth, and every time she laughed, she smiled like an evil kid.

歯磨きも進歩して下の歯の時は受け入れられる様になってきた。しかし上の歯の方が大きく難しい。

Toothpaste has also progressed and it has become acceptable for lower teeth. But the upper teeth are bigger and more difficult.

大人の虫歯菌をつけないで育てていけるかな。

I wonder if it can be grown without adult caries bacteria.