The main dangers of orthodontics are that it may lead to relapse, damage to the tooth surface and damage to the roots, and some patients may need to wear braces permanently. Long-term stability is a common problem with traditional orthodontics unless the patient chooses to replace the teeth. Otherwise, treatment usually leads to relapse. The frequency of relapse is still very high. The tooth surface is composed of enamel, a hard mineral coating that protects the tooth from decay. When brackets are used, these brackets react chemically with saliva, and this is when the enamel on top of the tooth erodes. Because the brackets are fixed to the teeth, they are difficult to clean, and if the teeth are not properly cleaned, this can lead to gum disease, tooth decay, and decalcification problems. In some orthodontic treatments there are patients whose roots may be damaged and over time some roots will dissolve as a result, but this tends to happen with fixed appliances. Removable appliances cause little to no root damage. There are some people whose teeth do not resolve the problem of crooked teeth with conventional treatment, so permanent orthodontic treatment is needed for this treatment wear may be a lifelong condition. The main hazards of orthodontic treatment are the above, and patients can choose according to their situation.