Dundee Dental Hospital was forced to close last week after a sterilisation failure.
Patients were turned away from the medical facility and NHS Tayside said the problem was caused by the breakdown of equipment.
The failure meant appointments for 276 patients were cancelled.
They will be offered rescheduled appointments as soon as possible, said the health board.
Some patients were not aware of the issue and turned up to be told they could not be seen.
Dozens of people were asked to leave the building around 10am and its doors were closed.
A spokeswoman for NHS Tayside said by 4pm yesterday the issues had finally been resolved and the faulty sterilising equipment repaired.
‘There are a whole lot of stages in the decontamination process for instruments and there had been a breakdown in the equipment in one part of that,’ she said.
‘It just meant there were no sterilised instruments to do any work.’
Officials hope to have the hospital back working as normal today (Monday).