You have worked painstakingly on your application. You have checked and rechecked your work. You finally press the Submit button only to realize—to your horror—that you are missing a comma, and you inadvertently used “too” instead of “to.” The admissions committee is obviously going to just throw your application out, right? Wrong!
Making a typo and pervasive sloppiness are two very different things. If you have multiple typos and grammatical errors throughout your essays and application, you send a negative message about your level of professionalism and desire to represent yourself—and thus the target school—in a positive way. But if you have a minor mistake or two in your text, you have an unfortunate situation on your hands, but not a devastating one. Admissions representatives understand that you are only human, and if you are a strong candidate, the entirety of your professional, community, personal, and academic endeavors will outweigh these blips.
Do not dwell on the mistakes. Do not send new essays. Just accept your own fallibility and move on.