This is one of the numerous appliances that combines a traditional Activator with a Headgear and strap that is attached via a head cap. The Teuscher-Activator is mainly worn just at night and, where possible, for just a few hours during the day. The strap, that looks rather strange at first, makes it possible to significantly reduce the length of time that the appliance has to be worn and to achieve good treatment results, even allowing the patient to breathe through the mouth at night, something that the Activator does not do so well. The decisive factor is not the special design of the Teuscher-Activator but the head strap itself. If we must have bi-maxillary appliances (i.e. braces that encompass both jaws in order to move the bite), they should always be used with a head strap as this significantly increases their effectiveness.