Bad Breath Problem!!!

by Helen
(Aberdeen)

My sister continually tells me my breath stinks. I don't know if she's lying or not, but my parents have occasionally told me to use mouthwash.

It gets embarrassing because one time a friend told me that I really needed to brush my teeth. I was really embarrassed.

I did a self-test by using a toothbrush to scrape the back of my tongue and it smelled not so nice. Help please?