A graying man armed with a screwdriver stole 15 packages of toothpaste from a Freeport Walgreens pharmacy on Monday, but a store clerk wasn’t smiling when he was threatened, Nassau police said.

First Squad officers said the 3:23 p.m. robbery was at the Walgreens at 89 Henry St. No one was hurt, they said.

Detectives said the robber — described as 50 years old with a graying beard, 5-foot-10 and wearing a black knit hat — took the toothpaste and left the store without paying.

The clerk, 31, confronted the suspect, who pulled a screwdriver and threatened to stab him, police said. The man then got into a gray Honda Odyssey and drive away, police said.

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It wasn’t clear whether the suspect smiled for the security cameras.

Detectives said anyone with information could call Nassau County Crime Stoppers at 800-244-8477.