It is not uncommon to have one or more teeth that are particularly sensitive to heat, cold, or pressure. If you have such a tooth, you probably want to know what caused it and what you can do about it. Here are some frequently asked questions, and their answers.

What causes teeth to become sensitive?
The most common cause of sensitivity is exposure of the tooth's dentin, a layer of the tooth's structure that is just below the outer protective layer (the enamel).

The dentin is sensitive but the enamel layer is not. Why?
The enamel is composed of minerals that are hard and protective. It is not living tissue and has no nerve supply. The dentin layer underneath is bone-like living tissue that does contain nerve fibers. It is protected by enamel above the gum line and by gum tissue in the area of the tooth's root, below the gum line. If the tooth's protective covering is reduced, the nerve fibers in that section of the dentin are exposed to changes in temperature and pressure, which they conduct to the inner pulp layer (nerve) of the tooth. The sensations that reach the tooth's interior pulp layer cause pain.

What causes exposure of the dentin layer in teeth?
Often the dentin is exposed by receding gums, causing areas of the tooth that are normally below the gum surface to be uncovered.

What makes gums recede?
One cause of receding gums is excessive, rough brushing techniques. This is particularly common in individuals who have a family history of thin gum tissues. Removing the film of bacteria called plaque requires only gentle action with a soft brush. This is one reason that we stress the value of learning proper and effective brushing techniques. Gum recession becomes worse after the uncovered dentin of the tooth's root is exposed to erosion from sweet and acidic foods and beverages, such as fruit juices.

Doesn't tooth sensitivity indicate decay?
Decay can also cause tooth sensitivity. As decay destroys a tooth's structure, it eventually invades the inner pulp of the tooth, causing greater and greater pain.

How can you prevent or reduce tooth sensitivity?
As we mentioned above, learn proper brushing techniques; we would be happy to demonstrate them. Use a toothpaste that contains fluoride, which increases the strength of the tooth's protective coating. In more serious cases, we can apply a fluoride varnish or a filling material as a barrier to cover sensitive areas. If you experience long-term tooth sensitivity, make an appointment for an assessment and diagnosis so that we can determine the cause and proper treatment.

Contact us today to schedule an appointment to discuss your questions about sensitive teeth. You can also read the Dear Doctor magazine article “Sensitive Teeth.”

The CDC (Centers for Disease Control and Prevention) calls fluoridation of drinking water one of the ten most important public health measures of the 20th century, along with such measures as vaccination and motor-vehicle safety.

A fluoride concentration of about one milligram per liter (1 mg/L), or 1 part per million (1ppm), in the water supply is associated with substantially fewer cavities. This concentration of fluoride (equivalent to a grain of salt in a gallon of water) has been found to have no negative health effects.

The connection between fluoride and oral health was confirmed in the first half of the 20th century, and by 1955 the first clinically proven fluoride toothpaste was launched. Fluoride-containing toothpastes are common today, along with other fluoride-containing products.

Protective Effects of Fluoride
Ongoing studies have shown that fluoride has both a systemic (through the body) effect and a local effect at the tooth surfaces. Tooth decay takes place as part of a kind of active war between de-mineralization and re-mineralization, in which acids produced by bacteria in plaque (a biofilm in your mouth) soften and dissolve the minerals (de-mineralization) in the tooth's surface. At the same time, the saliva bathing the tooth acts to re-harden the tooth's surface by adding minerals back (re-mineralization). If fluoride is present in the biofilm and in the saliva, it protects against de-mineralization.

The fluoride you drink in your water is deposited in your bones. Bone is an active living substance that is constantly broken down and rebuilt as a normal body process. As this happens the fluoride is released into the blood, from which it can enter the saliva and act on the tooth surface. The fluoride in toothpastes and products like rinses is delivered directly to the tooth surface. Fluorides can also be eaten in foods with high fluoride content such as teas, dry infant cereals and processed chicken, fish and seafood products.

Problems with Over-use
Eating or swallowing too much fluoride can contribute to a discoloration of teeth called dental fluorosis, which varies in appearance from small white striations to stained pitting and severe brown mottling of the enamel. To avoid this effect, monitor children's tooth brushing to make sure they use only a small amount of fluoride toothpaste and do not swallow it.

Adding fluoride to water has been controversial because some people believe that it may cause other harmful effects. However, most health experts believe that fluoridated water carries no significant health risks and significantly contributes to public health by preventing tooth decay.

Contact us today to schedule an appointment to discuss your questions about fluoride. You can also learn more by reading the Dear Doctor magazine article “Fluoride & Fluoridation in Dentistry.”

It may alarm some people, but finger or thumb sucking is a completely normal activity for babies and young children. In fact, sonograms often reveal babies sucking a finger or thumb while still in the womb! However, if children are allowed to suck fingers, thumbs or pacifiers indefinitely, it can become problematic, with serious consequences particularly as they get older.

The list below contains important facts about thumb sucking and pacifiers that all parents of young infants should know.

• The American Academy of Pediatric Dentistry recommends that parents and caregivers encourage children to stop thumb sucking by age 3.
• Recent studies have shown that pacifier use after the age of two may cause long-term changes in the mouth; thus these researchers recommend stopping pacifier use by 18 months.
• If thumb and finger sucking habits do not stop soon enough, the upper front teeth may tip toward the lip or not come into the correct position in the mouth.
• Most children who suck their thumbs or fingers tend to stop between the ages of 2 and 4.
• For obvious reasons, a pacifier habit is often easier to break than a finger or thumb-sucking habit.
• One tip for encouraging older children to stop this habit gradually is to use behavior modification with appropriate rewards given at pre-determined intervals to refrain from using a pacifier, or sucking fingers or a thumb.

Be sure to inform us if any of your children suck their fingers, thumb or a pacifier so that we can begin monitoring their development. Our general recommendation is that you schedule an appointment around your child's first birthday.

Dental decay is an infectious and very common disease, but it's also very preventable. Today's dentistry has many tools at its disposal to accurately determine your risk for tooth decay, lower it, turn it around, and completely prevent it. What's more, we can even reverse early decay. You might never have to see or hear the drill again.

Striking the right balance between factors that promote oral health and those that cause disease is of the utmost importance. And knowing whether or not you have indicators of disease or risk for tooth decay is a great place to start.

We will scientifically calculate your risk for tooth decay by:

1. Recording and monitoring your oral and dental health: Our risk assessment/evaluation form allows us to gather information about critical dental health habits. Oral hygiene habits, use of fluoride toothpaste, tobacco smoking, frequent snacking on sugary foods and beverages, and past experience of decay are all examples of disease indicators that will help gauge your level of risk. For example, using fluoride toothpaste decreases your risk, but smoking and between-meal snacking increases it.
2. Testing for decay producing bacteria: You've probably heard of dental bacterial plaque, the biofilm that sticks to your teeth, forming in the tiny little grooves on the biting surfaces of the teeth where decay starts (and along the gum line). Today, acid-producing bacteria responsible for causing decay can be tested by simply sampling your biofilm on a swab, and placing it in a meter to accurately determine acid-producing activity. A high number indicates high risk. You can see it for yourself in less than a minute.
3. Saliva testing: A simple history will tell us whether your mouth is dry or moist most of the time. A saliva test will tell us if your saliva is acidic or neutral. A dry acidic mouth promotes decay, while a moist neutral mouth with healthy saliva promotes health. Measuring salivary “pH,” the measure of acidity, is another factor for determining your risk for decay and reversing it. Special rinses can help reduce decay-producing bacteria and reduce acidity.
4. Very early decay detection: Modern ultra-low-dosage x-ray equipment allows us to determine the very earliest signs of decay. Decay that is detectable with the naked eye (or feel with a dentist's instrument, an explorer) is already at an advanced stage. Catching the disease very early with the help of this sophisticated equipment can allow us to reverse early decay before it has even turned into cavities. It can actually be reversed with remineralizing fluids, rinses that put calcium back into the tooth surfaces reforming and hardening them.

This is a new and exciting era in the fight against tooth decay and we have all the tools to determine your decay risk and reverse it.

If you would like us to determine your risk for tooth decay, please call the office to schedule an appointment. To read more about disease indicators and risk factors for dental caries, read the Dear Doctor magazine article “Tooth Decay: How To Assess Your Risk.”

Grinding, clenching, and gritting your teeth are common reactions to stress — but their results can be quite complex. Here are some questions and answers that will fill you in on what you may not know about this widespread problem.

My dentist said I was bruxing. What does that mean?
Bruxing means that your teeth are grinding upon each other. Many people carry out this habit subconsciously and are not even aware that they are doing it.

Is bruxing or gritting harmful?
Such habits are called “parafunctional” (from para, meaning outside, and function, meaning purpose). This is because these stress habits exert much larger biting forces — as much as ten times more — than in normal biting and chewing activities. This excess pressure can cause damage to jaw joints and muscles, resulting in muscle spasm and pain; and to the teeth, resulting in wear, fractures or looseness. They can also cause headaches, earaches, and even neck and backaches because of the pressures on various structures in the face and mouth.

What is the usual treatment for problems arising from these stress habits?
The first thing we want to do is relieve your pain and discomfort. Second, we want to stop future damage. Application of heat or cold is helpful, and mild anti-inflammatory and muscle relaxant drugs are prescribed for pain and muscle spasm. To prevent future occurrences, we may treat you with biofeedback or refer you to someone who can offer psychotherapy.

What is a night guard and how can it help?
A night guard is an unobtrusive thin plastic appliance that is made to fit over the biting surfaces of your upper teeth. These guards are so unobtrusive that they can even be worn during the day if your stress level is so high that you grind your teeth during the day. The guard is adjusted to leave the lower teeth free to move against the surface of the guard, but they cannot bite into the upper teeth. This prevents wear on the teeth and lets the jaw muscles relax, preventing the pain of muscle spasm.

Contact us today to schedule an appointment to discuss your questions about stress and tooth grinding. You can also learn more by reading the Dear Doctor magazine article “Stress & Tooth Habits.”