Like all cosmetics, lip gloss has a shelf life and should be replaced regularly to ensure freshness and effectiveness. Check the product packaging for any expiration dates or recommended use-by periods, and discard any lip gloss that has passed its expiration date. Additionally, if you notice any changes in the lip gloss's texture, scent, or color, it's best to replace it to prevent potential irritation or contamination. Generally, aim to replace your child's lip gloss every 6 to 12 months, even if it has yet to reach its expiration date, to maintain optimal safety and quality.