Nail Therapy EXTREME GROWTH combines the action of modern care formulas and the properties of ingredients of natural origin. Extreme Growth conditioner is an excellent base for nail polish, comprehensively strengthening and preventing the brittleness of the nail plate. How to apply; Step 1. apply every day one coat directly onto nails. Step 2. After three days remove applied coats and start the activity again. Apply regularly as each coat gets into the nail, extremely strengthening and hardening it.