I would definitely recommend using a fresh razor after about 4-5 shaves. Using a dull razor certainly leads to irritation, nicks and cuts. Also, try applying some aloe vera gel after shaving.....try keeping it in the fridge too. It will make your head feel nice and cool, and will tone down the redness. Lastly, I would recommend Aveeno Positively Smooth shave gel (light blue cap). It has some nice extracts in the ingredients, and helps prevent irritation, as well as nicks. I've been using it for over a year now, and the results are great. Good Luck!