While doctors don’t know the causes of bruxism, they have identified several contributing factors. For example, tooth grinding is sometimes a response to stress or anxiety. Sleep conditions and certain other disorders may increase a person’s chance of developing bruxism, as well. In addition, an abnormal bite and crooked or missing teeth have also been linked to tooth grinding and clenching.
The causes of bruxism are a little bit different for children. Commonly, kids start grinding their teeth due to allergies, illness or tooth misalignment. Because children’s teeth change so frequently, bruxism doesn’t usually lead to long-term damage.