September 22, 2023


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“Bite teeth authentication” could replace fingerprint as security identification?

3 min read

“Bite teeth authentication” could replace fingerprint as security identification?


“Bite teeth authentication” could replace fingerprint as security identification?

Biometric authentication methods such as fingerprint authentication and face authentication have been widely adopted, so have you heard of “teeth authentication”?



Two recent research papers from the United States and China proposed a new solution for tooth-based authentication: only Grinding or clenching your teeth, and an ear-worn device (a “ear-worn” that also doubles as a normal audio device) that recognizes the structure of the teeth (type of bite, strength, etc.) and the ear canal, creating a unique The sound waves are received by the headset, thereby verifying the identity.


"Bite teeth authentication" could replace fingerprint as security identification?


Previous methods of tooth identification (i.e. for living people) required users to “grin with their teeth” so that the tooth identification system could confirm that their teeth matched the biometric records.


The two dental certification systems of the latest research include: ToothSonic and TeethPass, among which ToothSonic comes from an academic collaboration between Florida State University and Rutgers University;

TeethPass is a collaboration between researchers from Beijing Institute of Technology, Tsinghua University and Beijing University of Technology and Philadelphia Sky. Results of a joint study by the Department of Computer and Information Science, University of Puerto Rico.


"Bite teeth authentication" could replace fingerprint as security identification?


The ToothSonic system in the United States has been proposed in a related paper, “ToothSonic users verify the ear through the sound wave effect of the tooth print generated by the tooth structure.”

In particular, the researchers designed a representative tooth mechanism that can generate effective sound waves, carrying teeth printed information.


In order to reliably capture the sound produced by the tooth print, the system uses earphones to extract multi-level acoustic features, thereby obtaining the tooth print information and performing authentication.


Recognition based on tooth marks is obviously more convenient and safer than the original authentication method that requires “grinning with teeth”, and it can also avoid embarrassing situations on certain occasions.


In addition, this method is also more friendly to many people with movement disorders.

For example, if the system is applied to the headset, there is no need to open a dedicated independent authentication device or open an APP.


"Bite teeth authentication" could replace fingerprint as security identification?


In terms of security, the ToothSonic system is obviously more secure than fingerprint recognition, face recognition and other methods.

After all, it is more difficult to replicate a person’s complete and complex tooth structure.

Even if the tooth structure is obtained, the uniqueness of the sound produced by the molars eliminates the safety hazard of the tooth structure being copied.


The paper examining the ToothSonic system outlines a number of unique features in a user’s dentition, including occlusal category (eg, occlusal), enamel density and resonance, and auditory information missing from extractions. The author states:

“The sound waves caused by the teeth marks are captured through the user’s private tooth-ear channel. Therefore, our system is resistant to advanced imitation and replay attacks because the user’s private tooth-ear channel protects the sound waves, which are less likely to be attacked. found.”


The working principle of TeethPass is basically the same as “ToothSonic”, and a large number of experiments show that the average authentication accuracy of TeethPass is 98.6%, and it can resist 98.9% spoofing attacks.

Simply put, this kind of teeth authentication is more convenient to use and has a higher safety factor. Even if the user’s teeth print is restored, it is difficult to crack.


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