It happens... life gets a little crazy and the lettuce is still sitting in the crisper day after day.... eventually looking less than it's best.
Don't throw out that sad looking lettuce, give it a nice ice-water bath for 5 minutes (make sure it's fully submerge), then pat dry.
Great Way to Store Your Lettuce to Give it a Longer Life:
Washing and drying your lettuce, then slice off the stem. Wrap your lettuce head in a towel or paper towel - will help to absorb any moisture, so that the head of lettuce will stay fresh for longer. Place the wrapped head of lettuce in a ziplock bag or sealed container (this stop it drying out and going limp early), and store in the fridge for up to two weeks.Happy Hacking 