There is little danger of dry shampoo exploding on a plane.  While aerosolized dry shampoos can explode if they’re exposed to heat or fire, when they’re left closed in your luggage they shouldn’t pose a risk of exploding.  The TSA does limit the total amount of aerosolized cans of dry shampoo or other beauty products that you’re able to pack, even in your checked luggage.  According to their regulations, you cannot pack any dry shampoo canisters that are larger than 18 ounces each.  You also cannot bring more than 70 ounces of dry shampoo total in your checked bag.