Since you got full mouth extraction so the chances of infection automatically increases if you don't take extra care of oral health. Ideally after an extraction, special care is needed only for a week or so but in case of full mouth extraction, healing is usually delayed so the patient should be extra precautious regarding his oral cavity.
Here are few of the tips:
For more info on after care of dental extraction visit the link....http://www.identalhub.com/article_do's-and-don'ts-after-tooth-extraction-153.aspx
Free Dental Consultation