YOU SAID:

I came in my toothpaste and then brushed my teeth

INTO JAPANESE

歯磨き粉を入れて歯磨きをした。

BACK INTO ENGLISH

I put in toothpaste and brushed my teeth.

INTO JAPANESE

歯磨き粉を入れて歯を磨いた。

BACK INTO ENGLISH

I brushed my teeth with toothpaste.

INTO JAPANESE

歯磨き粉で歯を磨いた。

BACK INTO ENGLISH

I brushed my teeth with toothpaste.