What are your eating habits like? Especially if you consume a lot of garlic, onions, or spicy foods, the smell can linger all day long. What you eat at night also affects your morning breath.
Does he/she smoke? It can cause serious damage to the teeth and oral tissues, and sometimes leave a lasting odor. Has he/she at least tried to quit completely?
Have you ever heard of something called Helicobacter pylori? It can cause stomach infections and lead to bad breath. It can be confirmed with a blood test, so pay attention to stomach complaints.
Does it mention having any metallic taste or strange feeling in the mouth? Some medications or excess vitamins can also lead to bad breath, especially zinc and iron supplements. If they are using any, take a look at the ingredients.
Another possibility: tonsil stones. These white, hard structures that form in the tonsils can cause serious bad breath. Have you ever shone a flashlight and looked inside your mouth?
Have you ever considered the possibility of acid reflux? The acid from the stomach can cause both odor and a bad taste in the mouth. Has this been going on for years, or has it just started recently?
Have you ever checked for gum recession or tooth decay? There can also be odors emanating from the tooth; the source of bad breath is not always the stomach or respiratory tract. Particularly if there is a tooth root infection, that can cause a bad taste.
Have you noticed the gaps between your teeth? Some people leave tiny food particles behind because they don’t use dental floss, and those can rot and smell. I recommend taking a closer look at your back teeth.
Have you ever experienced sinus problems before? Blocked sinuses can also cause post-nasal drip and lead to bad breath. Especially if you’re having trouble breathing through your nose, that might be a factor as well.
How often do people consume foods that have strong smells like garlic and onion at home? Some people retain these odors more, even expressing them through sweating. It may be necessary to reassess their diet.
Has there ever been a situation where your tonsils were removed? Some people think that without tonsils, infections don’t accumulate, but on the contrary, this time infections can accumulate more frequently in the throat and lead to odor. If this detail makes sense to you, it would be reasonable to see an ENT specialist.
Sometimes it can also be a sign of a chronic illness, like diabetes. In diabetes, there can be a different type of bad breath caused by ketones. Have you considered getting a blood sugar test?
Does he/she take any medication? In particular, antibiotics, vitamin supplements, or any other regular medications can disrupt the oral flora and cause odor. It might be useful to check the medication leaflet.
Could it be sleep apnea? If someone sleeps with their mouth open, both saliva decreases and bacteria can thrive more easily, which may also be the source of odor. You might consider seeing a sleep specialist.
Is there cigarette use? It both causes bad breath and can disrupt the balance of bacteria in the mouth, worsening the problem. If they smoke, we need to talk about it.
Does he/she drink water continuously? Dry mouth can also cause excessive bacteria. If saliva decreases, the natural cleaning mechanism doesn’t work, and odor becomes inevitable.
Are you experiencing any bleeding in your gums? Periodontal diseases are a serious cause of bad breath; just brushing your teeth might not be enough, and dental cleaning may be necessary. I would suggest getting checked by a dentist.
Was the presence of Helicobacter pylori checked? It can cause bad breath originating from the stomach, especially if this bacteria is present, as it combines with stomach acid and worsens the situation. It may be necessary to see a gastroenterologist.
Is it busier after meals, or in the morning? Is it related to digestion, or is there a buildup in the mouth overnight that needs to be understood? You can then plan a route accordingly.
Have you considered that you might have a fungal infection? If there is a white film in your mouth or residue on your tongue, this could be the cause of your bad breath. It is especially triggered if your immune system is weakened.