Ultrasonic sound is punishment. The higher the frequency ... devices usually become ineffective after a few days. You will ...

Ultrasound in the low-frequency (kHz) range may be more effective than high-frequency ultrasound, because low-frequency sound penetrates bone and tissue more effectively. Concerns have ...

Although further studies assessing safety (especially the effect of repeated extractions) will be required, our results indicate that with the conditions we used, low-frequency ultrasound does not ...