As someone who loves experimenting with makeup, I've learned the importance of paying attention to product expiry dates, especially with lipsticks. Many of us might overlook the small '12M' symbol on the packaging, which indicates that the product should ideally be used within twelve months after opening. Even if the lipstick looks and feels fine, its formula can degrade over time, leading to potential skin irritation or infections. From personal experience, I've noticed that dark-colored lipsticks tend to show signs of wear or changes in texture earlier than lighter shades. One helpful practice is to store your lipsticks in a cool, dry place to prolong their usability. Also, avoid sharing your lip products with others to minimize the risk of bacteria transfer. The '12M' mark is a useful guide to maintain both safety and quality in your makeup routine. When a lipstick passes this timeline, you might observe changes like separation, unusual smell, or a drying effect when applied, signaling that it's time to replace it. Taking a moment to check this can save you from unwanted skin reactions and ensure your makeup looks flawless every time. In summary, don't rely solely on appearance or scent to judge your lipsticks' viability. Regularly reviewing the '12M' indicator and adopting good hygiene habits helps keep your beauty routine both safe and enjoyable.