First, read the English article below.

Any gum will help with bad breath because the chewing action results in more saliva being produced. Some gums, however, have better bad-breath-fighting abilities than others:  Cinnamon flavoring seems to be especially effective in reducing bacteria counts in your mouth.  Look for gum sweetened with xylitol (sugar only feeds the bacteria, causing more odor problems). Xylitol is a sugar substitute that actually works to prevent bacteria from replicating in the mouth. A dry mouth is a stinky mouth. That's why your breath is worse in the morning; your mouth produces less saliva as you sleep. Saliva is the enemy of bad breath because not only does it physically wash bacteria and food particles away, but it also has antiseptic and enzymes that kill bacteria.  Chewing gum stimulates saliva production (in addition to covering up the odor with some kind of scent). Mints do not encourage saliva production.  Drink water. Swish the water between your teeth from side to side. Water won't necessarily increase saliva production, but it'll wash out your mouth — and it is good for you. See How to Drink More Water Every Day. Dry mouth can be caused by certain medications and medical conditions. Ask your doctor about switching medications, or addressing the underlying condition. In case you needed yet another reason to stop this dangerous habit, tobacco is notorious for causing bad breath.  Tobacco addiction can be a hard habit to break, so visit this helpful wikiHow page for tips and advice. In some cases, bad breath can be an early sign of oral cancer caused by smoking or chewing tobacco.  You must stop smoking and see your doctor to be evaluated for this very serious condition. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Cân nhắc nhai kẹo cao su. Giữ cho miệng luôn ẩm ướt. Ngừng hút thuốc và nhai lá thuốc.