Simon Cowell's "before and after" transformation primarily involves significant changes to his teeth and facial appearance over the past few decades. Before: In the 1990s, Simon Cowell had a natural, somewhat uneven, and yellowish set of teeth with an ordinary smile. His face had typical signs of aging without cosmetic enhancements. Over the 2000s, his teeth saw some whitening but still retained imperfections, and his facial appearance was natural without major cosmetic alterations. After: Starting in the 2010s, Cowell underwent considerable dental transformations, including whitening, veneers, and final refinements by the early 2020s to achieve a bright, natural-looking smile. Regarding his face, from the mid-2010s onward, he used Botox and facial fillers, which made his face smoother but also caused a puffier and less expressive look. By the 2020s, he reduced fillers and turned to non-surgical facelift procedures like Silhouette Soft Lift for a more youthful appearance. He also changed his lifestyle, including diet adjustments, to enhance his look. Despite some public criticism for overdoing facial fillers at one point, he admitted to dialing back and focusing on healthier skin care and non-invasive treatments. Overall, Simon Cowell's transformation is a journey of cosmetic dental work, facial aesthetic procedures, and lifestyle changes that significantly altered his appearance from the 1990s to today, balancing a camera-ready image with a more natural look.