How often do you have to change your underwear to keep clean?

Organic cotton: Ideal for sensitive, breathable and resistant skin.
Modal or bamboo: Ultra-soft and antibacterial.
Cotton-formaldehyde mixture: Good maintenance and optimal adjustment.
Substances to be avoided for daily use:
Non-breathing syntheses (polyester, untreated nylon).
Unlined lace, which may irritate the skin.
In short, how often to adopt?
Every day: Change your underwear and wash them after each use.
Every 6 to 12 months: Renew them if you notice signs of wear.
More often in the case of sports, excessive sweating or fragile tissue.
By applying these advice, you guarantee better hygiene and comfort on a daily basis.

How often do you change your underwear? Share your opinion as a comment.