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Metal ‘Gauge for selecting artificial teeth’ patented by John A Wavrin in 1921
Alessandra Boi
A variety of implements have been used to keep a patient’s mouth open for dentistry, oral surgery, and anaesthesia...
André Lenief patented its invention in 1923. At a time when toothbrushes were still expensive to purchase, interchangeable heads meant worn and smelly bristles could be discarded but the handles reused.
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