Summarize:

Seal your lips tightly immediately after taking a bite of food or sip of a drink. Don’t open them up again until you’ve swallowed all of the food or liquid. This will keep you from swallowing extra air by accident.  Similarly, avoid talking while you are chewing. Talking with an empty mouth is not only polite, it can lessen the possibility of air gulping. You can also ask a close friend or family member to watch you eating a few times and to alert you if you are opening your mouth while chewing. Eating or drinking quickly can result in more air slipping into your digestive system. This excess air can then cause burping. Choose to eat more slowly by pausing and counting after each bite. This will result in a more relaxing meal and lessen your possibility of gas. As you suck up the liquid with a straw, you are more likely to push excess air into your digestive system as well. Sipping lets you more closely control how much you are drinking at one time. This can be a hard habit to break, but it might be worth it. As you break down candy in your mouth, you may slightly open your lips and suck in extra air by accident. This extra air can then cause burping or hiccupping soon afterwards. If you really enjoy chewing gum, it can be hard to break this habit. When you feel like gum or candy, drink a glass of water instead. This will help to lessen your craving. If your nose or throat is clogged or congested, you run the risk of pushing extra air into your digestive system when you try to breathe. If you feel unwell, take a nasal decongestant to reduce your symptoms and open your airways. Breathing more freely will often reduce belching, too. Applying nasal strips to the exterior of your nose can also make breathing easier when you are congested. If you have to correct or adjust your dentures while eating or during the day, then you are likely letting extra air into your system. Go ahead and see if your dentist can adjust your dentures so that they don’t move during regular activities. If the fit is only slightly off, then your dentist may be able to make the corrections in-office. If the fit is very wrong, you might require a completely new set of dentures. When you suck on a cigarette you are pulling air down into your lungs, but some of it can slip into your stomach and intestines as well. Smoking multiple cigarettes just magnifies this effect. Smoking as a habit can irritate your digestive system enough so that burping can become a regular problem. Vaping can also result in excess gas getting trapped in your system.
Chew with your mouth closed. Count down from 5 after every bite or sip. Sip from a glass instead of using a straw. Avoid chewing gum or sucking on hard candy. Treat any cold or allergy symptoms quickly. Get your dentist to adjust your dentures if they are loose or ill-fitting. Quit smoking.