Exploring objects with the mouth (orofacial exploration disorder) is seen in Alzheimer’s disease dementia. Alzheimer’s disease dementia used to be referred to as progeria for those with onset before the age of 65 and senile dementia for those with onset after the age of 65. What are the screening methods for Alzheimer’s disease dementia? 1.Psychological scale tests Commonly used neuropsychological scales: cognitive tests are the Brief Mental State Examination Scale (MMSE), Mattis Dementia Rating Scale (DRS), Alzheimer’s Disease Assessment Scale (ADAS) and CERAD set of neuropsychological tests for the diagnosis of the disease, which are important methods to diagnose the presence or absence of dementia and the severity of dementia. EEG is a widely used and relatively inexpensive non-invasive auxiliary examination tool that is useful for the clinical diagnosis and differential diagnosis of dementia. The following points should be noted when evaluating EEG: (i) the frequency and amplitude of the rhythmic or non-rhythmic components of EEG; (ii) their distribution and symmetry of the left and right hemispheres; (iii) the morphology of normal and abnormal EEG waves; and (iv) the response of EEG waves to activation techniques, such as eye opening, inspiration, and light stimulation. The analysis of digital EEG data, also known as quantitative EEG, has now greatly improved the credibility and comparability of EEG data, making it more likely that subtle EEG changes will be detected during the course of the disease. The value for early diagnosis of chronic degenerative encephalopathy exceeds that of conventional EEG. the following describes the EEG changes in normal aging and several common dementias, respectively. 3. structural brain imaging Structural brain imaging examinations mainly include magnetic resonance imaging (MRI) and computed tomography (CT). The most common morphological change in degenerative dementia diseases is brain atrophy.