Night guard is a custom made appliance which protects the teeth from parafunctional habits like bruxing, night grinding and clenching. Grinding of teeth results in vertical and horizontal loss of tooth structure. This in turn causes changes in the bite and vertical height of the face.
Over the period, if the problem remains untreated, it causes irreversible changes in the temporomandibular joint which may give rise to pain in front of the ear, headache and loss of efficient chewing.