Hi, lately (about two weeks now) I've been having this really bad taste in my mouth. It's like a tartness but it's really gross. It tastes almost like the aftertaste of a lemon, but powdered kinda? I try brushing my teeth two/three times a day, I floss, and I use mouthwash but IT JUST WON'T GO AWAY! I tried telling my mom to take me to the doctor but she said it will pass.