Dental experts! what would happen if i drank mouth wash?

Read the label: The label on most mouth mouthwash bottles advise you to call poison control. Mouthwashes are not meant to be ingested. If you are reading the label and think because it contains alcohol you will get drunk, don't bother. It's not the type of alcohol you can drink. Unless you want to go to the emergency room feeling like you're going to die, don't try it.

Depends: Depends on the mouthwash, if it contains alcohol or other medicinal compounds and the amount you drank. From the poison control perspective, a small ingestion will likely just cause nausea and some vomiting. However, large ingestion of mouthwash could be harmful. Call the poison hotline and tell them which brand and how much.