Thanks @eyeofthemind for sharing this information. There are another ways also, like you can drink lemon tea. It simple to make at home. It is very effective and another way is you can eat 2 piece of blackpepper but you dont have to swallow that , just crush that with you teeth and keep it inside your mouth only for 30 minutes. It is also very effective. But it hurts little bit of your throat. try this twice a day. Thanks. :)