Any good remedy for bad breath?!

You can try to be disciplined enough to brush your teeth say three times everyday and then use mouth wash.

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Try brushing with common salt.

Or you could use sodium bicarbonate (baking soda, not baking powder) and hydrogen peroxide. Mix them together and brush.

Edit - It would be a good idea to visit your dentist to rule out gingivitis or periodontitis which could signal more serious problem.

Suffered from bad breath and nothing had worked before I tried these.

Flossing is really good. The bad breath is caused by decaying food that hasn't been brushed out properly. Over time (like most decaying things) it starts to spell bad !
If your not used to flossing, it can be quite difficult to get used to. It is worth it though & all your friend will think it is too.
Also, make sure your brushing your teeth properly, at least twice a day and last thing at night !

using common salt,hydrogn peroxide, baking soda etc is not a good idea..it'l weaken your enamel. In a couple of years time 'sensitivity' wil be your problem,not bad breath.
Flossing is a good idea too.

brush you teeth with a good brush morning and night,
use mouthwash after
floss will also help,
and also just use a strong chewing gum or mint :)

when you brush your teeth brush your tounge

Mouthwash?

Tongue scraper and/or mouthwash.

eat halthy
fruits
veg
lots of liquid