I am pleased with how my front two teeth straightened in 5 months. I was fortunate enough just to have the top tray. It is challenging to feel the tray in your mouth for so many hours. At times my tongue would get scratches on the tip from touching the tray. It makes you talk funny. Good for a semi-diet because you must floss and brush each time you take them off. I've never flossed so much!!!! My dentist says that I need to wear them at bedtime so they don't go back into the direction as before. They are straight now and next week my 7 composites will be removed. Happy Day!