Two recent research papers from the US and China have proposed a novel solution for teeth-based authentication: just grind or bite your teeth a bit, and an ear-worn device (an'earable', that may also double up as a regular audio listening device) will recognize the unique aural pattern produced by abrading your dental architecture, and generate a valid biometric'pass' to a suitably equipped challenge system. Prior methods of dental authentication (i.e. for living people, rather than forensic identification), have needed the user to'grin and bare', so that a dental recognition system could confirm that their teeth matched biometric records. In summer of 2021, a research group from India made headlines with such a system, titled DeepTeeth. The new proposed systems, dubbed ToothSonic and TeethPass, come respectively from an academic collaboration between Florida State University and Rutgers University in the United States; and a joint effort between researchers at Beijing Institute of Technology, Tsinghua University, and Beijing University of Technology, working with the Department of Computer and Information Sciences at Temple University in Philadelphia. The entirely US-based ToothSonic system has been proposed in the paper Ear Wearable (Earable) User Authentication via Acoustic Toothprint.