I had a tooth pulled 2 days ago. for how many days do i have to rinse my mouth with salt water?

Up to one week: Each extraction may require differnt post op care but in general you should rinse till you feel like no food is laying in the extraction site after eating. In general 5 to 7 days is good.

Varies: If you had an upper tooth removed, a few days would be fine, but if you had a lower tooth removed, where gravity tends to cause food debris to become trapped, i would use the salt water rinse for as long as a week.