Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Completely ineffective

I bought this to replace another one of my nail strengtheners. I'd hoped it would help me grow out my nails but it's so brittle it chips and peels at the slightest touch. It always seems to come off the chipped parts of my nails, which is exactly what it's supposed to be protecting! I'll have to go buy a different brand if I ever want my nails to grow out.