I swollowed crest whitening toothpaste about a teaspoon?

Not a problem: This is not likely to be harmful.

Will be fine.: That seems like a lot to swallow. Must be a good story behind that. In any case, you will be fine. Don't make a habit of this though.

Drink water: Drink water to dilute it and flush it out.

You will be okay: This quantity is not sufficient to warrant an evaluation. Take plenty of water to dilute the ingested toothpaste.

Probably okay: Concentrations of active ingredients are usually pretty low in toothpaste, but it is not recommended to swallow toothpaste. Some recommend water or milk unless pt. is vomiting. to be safe, the National Poison Control Center (1-800-222-1222) can be called from anywhere in the United States. This national hotline number will let you talk to experts in poisoning.