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"If the root is broken, it can now be fixed," said El-Bialy. "And because we can regrow the teeth root, a patient could have his own tooth rather than foreign objects in his mouth."
The wireless device, roughly half the size of a nail on your baby finger, will be able to gently massage the gums to stimulate growth of the tooth root.
Participants held the bulky ultrasound device for 20 minutes a day for four weeks against a tooth that had a problem, such as erosion after a root canal.
Long used as a test for pregnant women, ultrasound may soon have a new role -- growing teeth.