The visible part of a tooth, otherwise known as the crown, is only a small portion of the living system. The crown is made up of enamel, the hardest substance found within the body. It is bone that has been enriched with large percentages of calcium. That's why people who drink lots of milk or take calcium supplements have strong bones and teeth. The enamel is thickest at the crown, and thinnest near the roots of the teeth.
The permanent teeth are the second set of teeth that will last the rest of your life. They tend to be more yellow (and not just because of coffee) and are extremely hard. The final set of teeth is made up of 32 teeth, or 16 on each jaw. There are two central incisors for biting, two lateral incisors for biting, two canines for tearing and cutting, four premolars for chewing, and six molars for chewing.
New developments include the implantation of artificial teeth or binding posts into the gums or jawbone; antibiotic fiber for periodontal disease; root canal surgery, a procedure that ameliorates pain while permitting teeth to remain in place; and nearly painless lasers to repair dental cavities, usually making local anesthesia unnecessary.
The classic metal orthodontic braces are the most familiar method of teeth straightening. Consisting of a bracket glued to the front of each tooth and a metal wire connecting them, orthodontic braces usually require several years of wear for effective teeth straightening. They can be uncomfortable, expensive, and embarrassing for older patients. However, they are still the most effective method of teeth straightening and can correct overbites and underbites as well as individual teeth alignment.
Invisalign is one of the newest methods of teeth straightening and is extremely popular with adults. Consisting of a clear mold that is nearly invisible when worn, Invisalign uses a series of molds that gradually push the teeth into the desired shape. Invisalign does not cost significantly more than standard orthodontic braces, but cannot correct an overbite or underbite and is only a good choice for minor straightening. Invisalign is not as effective on major problems, which may require standard braces.
The most common method of teeth straightening remains standard orthodontic braces. Archwires, springs, and rubberbands apply pressure to the individual teeth by means of brackets that are glued onto their surface. Regular visits are required to the orthodontist in order to tighten wires as needed and make other adjustments. At each visit, the wires will be tightened slightly to renew pressure and push them toward their intended position. Additional wires, rubberbands, and headgear may be prescribed to help move the teeth into their ideal position as quickly as possible. When the teeth have all been repositioned, the brackets will be removed and a retainer must be worn to prevent relapse for some period of time.
While there is no medical need to whiten teeth, it is a procedure that can have a big impact on a person's self-esteem. Severely yellowed or discolored teeth can make a person self-conscious and reluctant to smile.
For individuals who are looking for a fast way to achieve dramatic teeth whitening results, in-office whitening is the way to go. Protective gel is applied to the gums, lips and other tissue around the teeth, and then a bleaching solution is applied to the tooth enamel. A high intensity laser or other type of light catalyzes the bleach, and the teeth are treated for one to two hours.
Some types of tooth discoloration are difficult to whiten and treat. Teeth that have been subjected to trauma may darken significantly, and resist any bleaching procedure. Some medications affect young children when their teeth are first forming and may also be nearly impossible to treat. Dentists will be able to tell what situations may result in bleach-resistant discoloration, and provide advice on how effective various treatments may be. In cases of extreme discoloration that cannot be subjected to common teeth whitening procedures, porcelain veneers applied to the teeth may be an alternative solution.
Terms explaining
Stomatology
Tooth bleaching
