For extremely small nail holes (not screw holes or cracks) in white walls, toothpaste can serve as a quick, temporary filler.

Ensure the hole is clean.
Squeeze a tiny amount of basic white (non-gel, no whiteners) toothpaste directly into the nail hole.
Wipe away any excess flush with the wall using your finger or a damp cloth.
Let it dry.
Note: This is not a durable repair, may shrink or discolor over time, and is only suitable for very small holes on white walls where appearance is not critical.

N/A - An extremely cheap and quick fix for minimal imperfections, but lacks durability.

Use White Toothpaste (Tiny Nail Holes Only)