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The Harbour Mouth Molars sculpture at the Kitchener St Reserve on Portsmouth Dr are to be highlighted by floodlights.
The six 6.5-tonne Oamaru stone and concrete wisdom teeth would each have a floodlight placed beneath it, Dunedin City Council community life general manager Graeme Hall said.
"The lighting has been funded by an anonymous benefactor who is an art appreciator and believed they were worthy of being floodlit," Mr Hall said.
The benefactor did not want the cost of the lighting revealed, he said.
The $45,000 installation was designed and constructed by Wellington sculptor Regan Gentry and financed by the Dunedin City Council's art in public places programme.
The installation attracted controversy when it was unveiled on April 10 this year, with many Dunedin people querying whether it was an elaborate April Fool's Day joke.
The lighting is expected to take three weeks to complete.