Chewing with only one side, the face appears asymmetrical, which is a common clinical 1 condition. This is certainly a time when one should apply both sides, or deliberately, the other side for some chewing. However, it is best for the patient to go to a professional dentistry department for an examination to see if there is any reason for the patient’s unilateral chewing. In general, it is common to see involuntary unilateral chewing due to missing teeth or dental diseases on one side of the teeth. For example, some teeth have premature tooth loss due to periodontitis, some teeth have obvious caries and periapical infection, once biting patients will have obvious pain symptoms, in this case the patient will involuntarily appear to chew unilaterally. In this case, first of all, the primary disease should be treated. For example, in the case of caries and periapical infection, the tooth should be repaired and root canal treatment should be performed, while in the case of missing teeth, the restoration of missing teeth should be performed. In this way, the patient’s teeth will be healthy enough to chew bilaterally, thus alleviating the facial asymmetry.