I've had them on for 12 years continuously. I've never had any problems. I have horrible nails and acrylics let me feel like I don't need to hide my hands. I go to a reputable salon that uses high-quality products. It costs a little more but it's worth it not to have to worry about infection or other problems. I have broken a nail off occasionally so I get a look at my original nails sometimes - they are fine.