1) Drink a little some green tea after foods rich with onion.
2) Drink lemonade, or if you can handle it, eat a lemon.
3) Slowly chew on a on a mint leaf or any strong flavored, fresh herb. Make sure your teeth don’t have any small pieces stuck to it afterwards.
4) Eat mixed vegetables mixed in a mashed potato like mush, vegetables like mushrooms and carrots seem to work well.
5) Chew mint flavored gum to cover up the onion taste and smell.
6) Simply brush your teeth! has been a cure since the beginning of brushing teeth.
7) Rinse your mouth with Therabreath Mouthwash.