Feeling fresh on waking in the morning itself is energizing, at the same time bad breath can ruin our whole day. This is a very common condition affecting people living in London W1 irrespective of their age and gender. Bad breath, halitosis, or fetor oris is a condition where an unpleasant odour comes out of mouth while exhaling. It could be due to different reasons. Generally, bad breath occurs due to some conditions of mouth, tongue, gums, or teeth. The commonest cause is improper oral and dental hygiene. Sometimes it could be due some disease conditions affecting the respiratory tract such as sinusitis, tonsillitis, chronic lung disease, or other systemic conditions such as diabetes, liver, kidney diseases, etc. Sometimes, this could be psychological too. Here, the person has a delusion that he has bad breath, which actually is a misconception and is referred to as pseudo halitosis. If you have the habit of taking garlic, onion, coffee, tobacco chewing, or smoking, these things can develop bad breath lasting for a few hours. Sometimes, it could be due to xerostomia i.e. dry mouth, which results from mouth breathing, or due to some conditions affecting salivary glands. Improper functioning of salivary glands can lead to reduction in the production of saliva, which is very important in keeping the mouth clean and moist. Halitosis can be scientifically diagnosed using Halimeter, which is a sulphide monitor that detects the quantity of sulphide in the exhaled air. Other diagnostic tests available in London W1 include BANA test, gas chromatometry, and beta galactosidase tests. The important thing we have to remember is to avoid natural causes of halitosis such as food items that cause bad odour, quitting smoking, coffee drinking, etc. Maintaining good oral hygiene is of prime importance, as food items collected in the mouth would decay due to the action of numerous bacteria in the mouth producing foul gases. During sleep, our mouth is not protected by saliva, as salivary secretion decreases during sleep. Hence, proper brushing and cleaning before and after sleep is very important in maintaining oral hygiene. if you suspect halitosis even with good oral hygiene, you should visit your dentist as soon as possible, to determine the proper course of treatment and if needed a referral to your physician for further evaluation. The treatment depends on the primary cause, which causes the complaint. If you have sinus infection or cough with expectoration of foul mucus, that can result in bad odour from mouth. In most cases, it is not easy to find the exact cause, hence general measures such as proper brushing of dentures or teeth and cleaning back of the tongue with gentle brush or scraper to remove the collected bacteria are very important. Gargling with a good mouthwash also helps you keep the breath fresh. If there is any gum infection, we have to treat it completely. Drinking adequate quantities of water, eating nutritious breakfast, good oral hygiene, gargling with mouthwash, chewing sugar-free gum, eating carrots etc. may help to reduce the condition.