What are some reasons for really bad breath in a child with no teeth cavities?

Halitosis. Sinusitis, adenoiditis, foriegn body in nose and gerd would all be possibilities.
Oral hygiene. My first concern is a foreign body in the nose -- a rotting bean. Don't worry how it may have gotten there, kids are kids. Most bad breath in adults and children is due to decaying crud in the mouth, between the teeth or on the tongue. A good dental flossing with running it over the back of the tongue cures most of these. If it does not, look for a problem in the upper aerodigestive system.

Related Questions

My daughter 8yrs has really bad breath. She is cavity free and has perfect teeth. How can I fix this?

Many other causes. There are lots of other possible causes. Poor oral hygiene, post nasal drip, GI problems, etc. See the following website and then consult both with a dentist and a pediatrician. http://smilesapartcosmeticdentist.com/fresh-breath-control.htm. Read more...
. Regular and adequate brushing. Bad breath might be because of multiple reasons other than teeth. Get her to see a dentist to see if she has plaques, it may not be visible to untrained eye. And also if the dentist is not able to find reason for bad breath, you may want to consult a physician to check for other reasons for bad breath. Read more...
Several things. Bad breath can be caused by a few things. Lets start with the mouth. Bad breath comes from either the teeth or the gums. If we rule out the teeth that leaves the gums. The next items could be post nasal drip or the throat or the stomach. See an ENT to be sure. Next there is an oral salivary test to check for other types of bacteria if everything comes back negative. Read more...
Multiple causes. Please see both dentist and pediatrician, who may in turn wish to refer you to specialists, to check for: flossing to remove bacteria from between teeth, need for cleaning back of tongue, infected tonsils &/or adenoids, post-nasal drip, gerd, etc. Read more...
GI issue or tonsils? Perfect teeth and bad breath could be a GI problem or even tonsils. After eliminating the possibility of any dental problem, i would make an appointment at your pediatrician to start investigating a medical issue. Read more...

Been told by my dentist-i need 2 hav extraction of 1root tip, n hav my teeth filled cause of cavities. Should I go to see ENT and gastroenterology for my bad breath problem. I just want to get rid of bad breath

Bad . Bad breath can be caused by many things. Poor oral hygeine is the most common. The dental problems have to be addressed by a dentist. Try brushing the very back of the tongue once a day--that may help after doing that for a while. Sometimes that is difficult due to the gag reflex. Read more...
Fix your teeth ASAP. Decay in the mouth can cause bad breath. You should have them taken care of before they get infected and cause more problems. Read more...
See a Dentist. Halitosis(bad breath) can be caused by periodontal disease, carious teeth (cavities) and certainly a retained root tip may cause inflammation and a consequent bad smell. You need to get the disease out of your mouth to have good breath again. Go see a dentist and get your teeth fixed. Read more...
Bad breath. The cavities and root tips are an obvious source of the bad breath. Any mouth problems should be dealt with first, cavities are rotting parts of teeth. If there is still a problem after the obvious then seek more obscure answer. Read more...
Dentist-ENT -Gi . Bad breath is called as halitosis and tooth decay is a very common cause of it. I would first get the teeth fixed so that there are no cavities. Inspite of this if you still have bad breath then you can consult an ENT and a GI physician. A few GI disorders can cause halitosis but they are are relatively rare compared to an oral cavity cause for halitosis. Read more...