The only issue I am having is that the tubes are not lasting 4 weeks. I am...

The only issue I am having is that the tubes are not lasting 4 weeks. I am following the directions very closely, but only got two weeks out of each tube I ordered. You all kindly sent me a third tube when the first one ran out quickly, but the second tube ultimately did as well. So, I am about five weeks in and already on my third tube. That is my only complaint so far, you all are amazing with everything else.