Nail Doctor Cuticle Oil Massage. The Nail Doctor Critical Cuticle Care cuticle massage oil. Problem... uneven surface & discolouration. Solution... Critical Cuticle Cure is a soothing massage oil that helps seal in moisture, hydrating the cuticles & nails. Solution... The Nail Doctor Critical Cuticle Care is a soothing massage oil that helps seal in moisture, hydrating the cuticles & nails.