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For years ultrasound (sonic vibrations with frequencies beyond human hearing) has been used to noninvasively examine internal structures of the human body. One of the most common applications is viewing a developing baby within the womb. But ultrasound can also serve as a medical treatment, not just a diagnostic tool. Here are six examples (in no particular order) of such treatments.

1) Ultrasound has been used to break up kidney stones and gallstones into smaller, more manageable pieces.

2) Astonishing results have shown that ultrasound therapy is an effective way to improve the healing of broken bones. Treatments in Glasgow have mended injuries that doctors doubted would completely heal at all. 
3) Israeli scientists developed a way of using ultrasound to kill brain tumors. Sonic energy is transferred through the skull and focused on a tumor without cutting it open. This noninvasive, sonic surgery could be a great relief for both the surgeon and the patient.

4) Ultrasound can be used to enhance drug effectiveness. It makes targeted cells more receptive to absorbing chemicals that help fight disease, especially cancer.

5) Canadian researchers have invented a tiny ultrasound device for dental patients. Ultrasound applied to the jaws can cause tooth roots to regrow. This treatment is helpful for teeth that have fallen out or become loose from playing hockey or wearing braces.

6) DARPA is funding the development of a portable device that stops internal bleeding. Intended for soldiers on the battlefield, the Deep Bleeder Acoustic Coagulation (DBAC) project promises automatic detection of ruptured blood vessels using ultrasound. Once the site of bleeding has been located in 3D, the device will noninvasively cauterize the internal wound with high-intensity ultrasound.