Décolleté wrinkles—those pesky lines that form just below your collarbone and extend down between your breasts—result from a combination of factors including diet, age, sun exposure, side sleeping, and collagen breakdown. Thankfully, there are steps you can take to heal these lines and even prevent them from forming altogether. Diet can be addressed by eating more fruits and vegetables, drinking plenty of water each day, and including superfoods like almonds, avocado, and tomatoes. Sun...