A few days ago, Dr. Martín from San Sebastián and Dr. Canábez from Barcelona gave a 2-day course in San Sebastian where they explained the importance of using 4D in the orthodontic office on a daily basis. They introduced the attendees to the latest in 4D technology, the ModJaw device. This device is capable of registering jaw and joint movements in real time. It is a very important advance in our profession since since it will allow us to be able to make more precise diagnosis and especially in the treatment of patients with dysfunction of the jaw joint. Both Dr. Martin and Dr Canabez already use the device routinely in their offices.