I bought three of the Medidenta Air Free handpieces for the occasional patient who takes an hour and a few carpules of lidocaine to remove their braces. Initially when I purchased the handpieces my staff and I were concerned at the heat we thought was being generated by the handpiece. Medidenta reached out to me after hearing about my concerns. Sent me the correct burs which I like better and heat problem is resolved. Thanks to Medidenta for the great customer service and great handpiece. My patients and I are grateful!