Islamic Interpretation of Dreams (Ibn-i Sirin):

(Setting the tooth on its edge.) To set one’s tooth on its edge in a dream means a betrayal carried by a member of one’s family the tooth represents.

This includes one’s children, wife, partners, or employees.

To set one’s teeth on their edge in a dream also could mean changes in one’s behavior that may lead to a changing attitude on the part of such family members.

(Also see Body’; Tooth)