Shake a small amount directly onto clean, dry feet or inside shoes and socks. Use daily and in all your shoes.
For external use only

Yes. Foot Dust is designed for everyday use on clean, dry feet and inside footwear.

Foot Dust works hard all day. This great smelling foot powder keeps your feet and shoes feeling fresh and smelling great all day.

Foot Dust is talc free and made with natural ingredients all formulated to give you great smelling feet and shoes. 
Ingredients are: Tapioca Starch, Magnesium Carbonate, Bambusa Arundinacea Stem Powder, Kaolin, Maranta Arundinacea Root Powder, Sodium Bicarbonate, Parfum, Hexyl Cinnamal, Benzyl Salicylate, Coumarin, Citronellol, Limonene, Terpineol, Lavandula Oil/Extract, Eugenol, Linalool, Linalyl Acetate, Carvone.

That depends on how often and how generously you use it, but a little goes a long way. Over 100 shakes per bottle.