40 years at the chair. Then I made my own.
I tested every retractor on the market. Some flexed in the cheek. Others rusted after fifty cycles. The wide ones got in the way of the lens. The narrow ones didn't pull enough tissue to see the distal of the second molar.
So I designed the shape I actually wanted — wide enough for clean photography, narrow enough for patient comfort, in a grade of steel that survives a serious workload. We manufacture them in the EU, register them under MDR, and ship them from Switzerland.