Overpriced regular earplugs
As a pediatric dentist, I was really hoping that these would work as advertised.  Hearing my assistants, anesthesiologists, monitors and patients during procedures is extremely important.  I was a bit skeptical from the beginning but was convinced to purchase after reading some of the reviews.  After comparing it to regular earplugs of a similar type for $0.99/pair, there was absolutely no difference in performance.  It just muffled everything, not just the frequencies of the suction and handpiece as advertised.  Returned for a refund after trying them for a few days.
Rating: 2 stars