If you are in sales, personal grooming is important. Make sure you schedule haircuts in a regular basis. Also trim your nails (hands and feet), trim facial hair including face, nose, eyebrows, and ears on a regular basis. Males should wear undershirt to keep dress shirts dry and sweat free. How you dress includes how you groom yourself. You don't want any distractions during your sales pitch. After all, it's the right thing to do and it models the way for others.