Hydréa London Dual Sided Hand & Nail Brush with Bristles Hydréa London Dual Sided Hand & Nail Brush with Bristles Use to exfoliate hands and deeply clean hand and nails! The Hydréa London Dual Sided Hand & Nail Brush with Bristles is a medium strength brush with short stiff angled bristles along the top and longer bristles underneath, making getting to tougher areas easier.