Bad breath is a very common dental problem and can be referred to as unpleasant dour exhaled from mouth. It is medically called halitosis.
Bad breath can result from poor dental health habits and may be a sign of various other health problems.
It can get more worse with the passage of time.

Various causes

There are a number of factors responsible for it. Some of the factors are as:

-Poor oral hygiene
-Dry Mouth
-Certain Lifestyle
-Particular Foods
-Bacteria on the tongue
-Gum diseases
-Cavities

Poor oral hygiene is considered as the primary cause of bad breath.
Food particles in your mouth,can be cause for this. These pieces of food can rot, may begin to collect bacteria and thus mouth will stink.

Dry mouth also causes it.

Saliva is considered very important to individuals because it produces enzymes that help to digest the foods we consume, it helps to balance the acid levels in the mouth, and it also creates high amounts of oxygen that helps to keep the oral tissues safe.

Certain lifestyle habits may also be responsible for it. People who do not brush daily, or people who smoke or chew tobacco do have bad breath.

Particular foods are another cause for the it.

There are certain foods that can aggravate the bacteria and cause them to reproduce in high numbers.

Your tongue may be having millions of bacteria each pouring out loads of stench.
It is important to rule out any medical or dental problems for chronic bad breath. Your tongue appears as a carpet for bacterias.

Gum disease may be an indication of poor health or weak immune system which allows bacteria to thrive.

Cavities are decays and decays do cause odors. The cavity will get more worse if it is not filled.
Author is a
LA invisalign dentist and can be reached out at his website http://ladentist.com/