I've been using whitening toothpaste for a year and I can't see any difference.

How to say “I've been using whitening toothpaste for a year and I can't see any difference.” in Japanese

In Japanese

ホワイトニングの歯磨(はみが)き粉(こ)、もう一年使(いちねんつか)ってるのに全然変(ぜんぜんか)わらないんだけど。

Howaitoningu no hamigakiko, mō ichinen tsukatteru noni zenzen kawaranai n da kedo.

I've been using whitening toothpaste for a year and I can't see any difference. in other languages