I recommend an interdental brush.

I highly recommend interdental brushes.

I used to feel refreshed just by brushing my teeth, but at some point, that feeling stopped, and I was worried. However, since I started using interdental brushes, I feel so much better. It seems like my bad breath is disappearing, and my mouth feels so clean after using them. If you haven't tried interdental brushes yet, you should definitely give them a try. They are really good.