The product I use often is

I use dental floss, but even if I don't have floss, I absolutely need this.

I always make sure to pack it even when traveling, but if I happen to forget, I have to scrape it out with something else.

Tongue cleaner heh

It is an indispensable necessity for me.

I bought this a long time ago, but it's so...

I like it so much I can't change it.

I bought a few other things, but nothing compares to this one.