I had 17 attachments applied and never had any problem with them either when they were put on or wearing them. I went in to have my next set of trays and they took the old attachments off and gave me new ones. The one tooth that is now sensitive and causing me a lot of pain ( never a problem with this tooth previously )They did have trouble putting the new attachment on that tooth and had to attempt it 3 times. Not sure if the process taking off the old attachment or putting on the new one that caused the problem. Anyone have the same complaint? How long did it last? is there any treatment to fix it? I'm nervous it will always be this sensitive and how I will tolerate the next time they have to take the attachment off.Thank you for your help!