That’s what the second hole in the bathroom sink is for. It has an essential role.

Maintenance Tips
Clean Regularly: Debris, soap scum, and mold can accumulate in the overflow hole. Use a small brush or pipe cleaner to keep it clear.
Check for Blockages: If water isn’t draining from the overflow hole, there may be a clog in the channel. Flush it with warm, soapy water or a vinegar solution.
Inspect for Leaks: Ensure the connections between the overflow channel and the drain are secure, as leaks can cause hidden water damage.
Fun Fact
While it’s primarily functional, the overflow hole also plays a small aesthetic role by preventing watermarks and stains around the sink’s edges due to constant overflows.

This little feature in your sink is more than just a design quirk—it’s a crucial element for convenience and safety! 🚿