Prettiness dies quickly.

Physical attractiveness is presented as something that fades rapidly rather than remaining reliable over time. The saying directs attention to the temporary nature of outward appeal and its limited durability.

It warns against giving appearance more lasting importance than it can bear. Judgments or attachments based chiefly on prettiness may weaken when the quality being admired soon changes.

Use it to comment on appearance fading or to caution that looks alone are a fragile basis for judgment.