I had a monthly check up because I have braces. The dentist said I only have one crooked tooth left, so he used this blade look alike to make spaces in my teeth. It was kind of like flossing, but worse. It was so painful, he kept hitting my gums. I was bleeding so much. I wanted to cry, first time I wanted to cry when it came to my braces. Couple days later, my gums started hurting. There is a pimple look alike, with puss surrounding it. It's on the left side, under my teeth. It hurts to eat and brush my teeth. I think it hit one of my nerves.