Thumb sucking is a natural reflex for children. Sucking on thumbs, fingers, pacifiers or other objects may make babies feel secure and happy and help them learn about their world.
Young children may also suck to soothe themselves and help them fall asleep.
How Can Thumbsucking Affect My Child’s Teeth?
After permanent teeth come in, sucking may cause problems with the proper growth of the mouth and alignment of the teeth. It can also cause changes in the roof of the mouth. Pacifiers can affect the teeth essentially the same ways as sucking fingers and thumbs, but it is often an easier habit to break since a pacifier can be removed from the situation.
When Do Children Stop Sucking Their Thumbs?
Children usually stop sucking between the ages of two and four years old, or by the time the permanent front teeth are ready to erupt. If you notice changes in your child’s primary teeth, or are concerned about your child’s thumbsucking, consult your dentist.
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The Food and Drug Administration recommends that parents and caregivers not use benzocaine products for children younger than age 2. Benzocaine is an over-the-counter anesthetic, which the FDA notes is marketed under the product names Anbesol, Hurricaine, Orajel, Baby Orajel and Orabase. Benzocaine has been associated with a rare but serious—and sometimes fatal—condition called methemoglobinemia, a disorder in which the amount of oxygen carried through the bloodstream is greatly reduced.
Teeth grinding, also called bruxism, can be caused not just by stress and anxiety but by sleep disorders, an abnormal bite or teeth that are missing or crooked. People who drink alcohol and smokers are approximately twice as likely to grind their teeth. The symptoms of teeth grinding include dull headaches, jaw soreness, teeth that are painful or loose, and fractured teeth.
Sparkling water is far better for your teeth than sugary drinks. In addition, be sure to drink plenty of regular, fluoridated water, too—it’s the best beverage for your teeth. Water with fluoride naturally helps fight cavities, washes away the leftover food cavity-causing bacteria feast on and keeps your mouth from becoming dry (which can put you at a higher risk for cavities). 
When You’re Working Out
When You Need Something to Drink
Fruits and vegetables: These should cover half your plate at meals. They are high in water and fiber, which balance the sugars they contain and help to clean your teeth. These foods also help stimulate saliva production, which washes harmful acids and food particles away from teeth and helps neutralize acid, protecting teeth from cavities.