In the Robi Comb's Directions for Use pamphlet, it says, “Comb infested hair daily for two weeks in order to detect and kill any new lice which have hatched since you began treatment.” So although the Robi Comb may zap everything, it does not prevent lice eggs from hatching.

Do electric nit comb kill eggs?

Best Electric: V-Comb Electric Head Lice Comb

The suction will pull any eggs, lice, or dandruff into the device where it will be captured in a small disposable filter.

How effective is Robi Comb?

From the United States. 5.0 out of 5 stars The Robi Comb is the Excalibur that vanquished our lice problem! ... Regardless of how diligent our household was about becoming lice-free, so many other children were infested in the schools that we had a new household infestation every 3 to 4 months.