How does bad breath occur?

Hi yahoo answers tell me the causes for the bad breath….

Spicy foods and onions contain sulfur byproducts that are absorbed into the blood stream, and are expelled by the lungs. Additionally, alcohol-containing mouth rinses dry the mouth, causing a condition for bad breath…Gum disease, most certainly, can cause bad breath and even smoking is also the causes for the bad breath….

i keep having the same dream since i was a girl..any scientific explanation for this?how n why does it happen?

i hv a couple of same dream since i was a girl(i cant remember how old i was,about 9 sumthing,now i`m 21).sometimes i get dejavu..when i was a girl,i had this dejavu almost every day (i`m also experiencing a bad headache and nausea when it occur) .it gets seldom as i grow up..but i`m still experiencing it until now (the last i had was yesterday).this dejavu,i felt like i`ve seen/been in that particular place b4,but in my dreams.
while the same dream i had was like,i`m in a big swim`g pool,and i swim under water without having to go up and take a breath..there are a couple more,but i cant recall..
i hope for some scientific explanation on how and why does my dream and dejavu keeps happening..thank you

I do not want to scare you but this is a question for a neurologist and sounds a little like a petit mal siezure. This may not be a dream at all. If it is accompanied by a headache, nausea, and some mental confusion… I can say that maybe you should talk to your physician and possibly a neurologist. Don’t be scared just know that you may be able to find the answer with this path. The Neurologist can give you a scientific explanation.