Halitosis itself is a symptom of an underlying problem. If you feel a foul odor on your breath when you exhale, look out for the possible causes inside and outside your oral cavity. Another way to check whether your breath has an odor or not is to lick your wrist and let the saliva dry. After a few minutes, smell your wrist to figure out if you have bad breath or not. Since most of the causes arise within the oral cavity, the patient might also present with plaque deposits on the tongue and around teeth, redness and bleeding from gums, and multiple carious lesions.
For stones that do not go away on their own, there are several types of treatments: Medications: Antibiotics to help reduce bacteria Antihistamines to reduce mucus from sinus problems or allergies Laser treatment (laser tonsil cryptolysis): a noninvasive treatment that helps minimize or remove the tonsil pockets (crypts) where the tonsil stones are lodged Coblation cryptolysis: radio waves are used to change a salt solution into charged ions that can cut through the tissue to reduce crypts on the tonsils and eliminate tonsil stones Tonsillectomy: removal of the tonsils, usually the last resort but the only way to eliminate tonsil stones and prevent new ones from forming

Ans. They are formed as crevices add debris such as food, bacteria, dead cells, and calcium build-up. As the build-up hardens, it forms white-yellow calcified stones.
Another way that alcohol can lead to bad breath is by changing the makeup of bacteria in your mouth. A study published in Microbiome found that people who drank the most were more likely to have bacteria in their mouths that contributed to bad breath.