While straightentng your teeth with braces/aligners, add comfort, speed with vibrations, infrared device in orthodontics, Invisalign.
Two Viber125 High Frequency - Free Shipping
Vibrations only - USB Powered
Frequency 125Hz - Made in USA
5 minutes only per day
Free shipping USA only
See comparison between Low and High Frequency:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207979/
Full Warranty One Year - Refund or replacement