If they’re applied subtly and correctly and no one can tell the difference, why not? Just keep in mind that you’re in a place of business, so you’ve got to keep it professional and neat. In other words, stay away from cat-lady claws painted bright orange and diamond embellishments that spell out your boyfriend’s name. Opt for shorter lengths and soft, nude shades or try out a trendy navy blue or hunter green, which are huge this fall. Incidentally, the same standard of subtleness and taste applies to hair extensions.