Can i use mouthwash the day after having teeth extracted?

After extraction: That is best answered by the dentist who extracted your teeth. When to resume normal routine varies from dentist to dentist.

Not advisable: The chemicals in mouthwash are not kind to recently surgeries tissues. Your Dentist or Oral Surgeon should have given you written post-surgical instructions. Follow them. If you did not receive written instructions call the treating General Dentist or specialist Oral Surgeon for appropriate post-surgical care.