Bad breath usually gets worse:

• When you wake up from your sleep:

A dry mouth causes bad breath and odor to come out of your mouth at an accelerated speed. During sleep, the tongue and mouth dries up due to lack of saliva. As saliva starts increasing in levels, the degree of bad breath comes down.

• After eating copious amounts of milk products and meat:

After eating products with high levels of proteins, such as milk products and meat, the level of bad odor from the mouth goes up.

If a little piece of meat remains between you teeth for a time, it is rapidly putrefied to toxin compounds. Foods containing excessive amount of onions, garlic, and various spices may cause bad breath.