- Effective whitening procedures have always been expensive and limited to dental clinics. Our novel PAP+Hap formula is here to change that. Now get clinic-like results from the comfort of your home. We promise noticeably whiter, stain-free teeth at the end of the 14 treatments. Revolutionary whitening formula starts showing visible results from the third application Onwords and eliminates years of staining and yellowing from the enamel. Simply use the strips once a day for 30 minutes as you go about your day to get visibly whiter teeth at the end of 2 weeks.