I would say it's gentle enough to use often. Can you use this if you have fine hair? You can but it definitely won't give you volume because it's very moisturizing. Revive and restore your dry and chemically treated hair and give it back the nourishment it needs with the Living proof. Restore Shampoo & Conditioner... How to use Start with Living Proof’s Restore Shampoo. Removes dirt, sweat, oil, pollution, and product buildup K18 Professional Molecular Repair Hair Mist (5 Oz) 4-minute Pre A strengthening, silicone-free shampoo proven to reverse damage, keep hair cleaner and healthier for longer, and transform the condition of hair -If you have frizzy hair and previously used Restore Shampoo and Conditioner for a high level of conditioning, try Living Proof’s No Frizz Shampoo and Conditioner. How often is safe enough to use this? This product is sulfate-free and is relatively gentle and color-safe. Does this product prevent hair dye fading? The hair thrives when you use the shampoo and conditioner. Sulfate-free Shampoo For Colored Hair Lvng Proof Restore Shampoo & Condtoner Set 236ml 8.0 Fl Oz Each New Smoother Hair Conditioner Color stays longer as well.