CHEMISTRY HELP please?

ok, so when you place a salt crystal in a water solvent the polar covalent bonds in the h2o gives oxygen a partial negative charge because of its electronegativiety thus the hydrogen becomes slightly positive. the oxygen attracts the sodium cations and the hyrdrogen attract the chrlorine ions hense breaking there bond. since chloride is a poisonus gas and sodium is a metal why isnt salt water toxic. you are breaking the bond in the crystal there for chlorine is present in a alone state. does chlorine have to covalently bond to another chlorine atom in order to become toxic. thanks also if you where to dissolve salt in water could you some how allow the water to evaporate and would sodium metal be present or would the sodium ions and chlorine ions rebond and just form salt again.thanx!