Like a great new haircut or a terrific skin care regimen, healthy, well-manicured nails are an integral part of a neat, pulled-together appearance – one that can work as an asset in both the social and the business world. Unfortunately, experts say both men and women fall prey to myths and old wives’ tales about how to care for nails. Another pitfall: many of us rely on the guidance of salons, some of which may not be doling out the best advice — or treatments. To help set the record straight — and get you on the road to beautiful nails — three top dermatologists offer these 12 tips for achieving healthy,…