Final answer:
Fluoride custom trays are typically for patients at high risk for dental caries and those with severe dental decay or dry mouth conditions. They are not usually recommended for areas with high natural fluoride levels, for very young children, or pregnant women due to the risks of dental and skeletal fluorosis and potential material allergies.
Step-by-step explanation:
Fluoride custom trays are recommended for patients who require a higher concentration of fluoride due to being at high risk for dental caries or those who have already experienced severe dental decay. These trays are also beneficial for patients with xerostomia (dry mouth), which can increase the risk of decay since saliva's natural remineralizing effects are reduced. Individuals residing in areas with high levels of natural fluoride, leading to dental and skeletal fluorosis, may not need additional fluoride exposure and thus would not typically be candidates for fluoride custom trays.
Community water fluoridation is a cost-effective means to deliver consistent fluoride levels and reduce tooth decay by 25% in both children and adults. Fluoride's efficacy in preventing dental caries also supports the tooth enamel's strength and can contribute to the reversal of early decay. Stannous fluoride has shown to be particularly effective in cavity prevention and gingivitis control.
Patients who may benefit from fluoride custom trays include those who are more susceptible to cavities due to their diet, oral hygiene habits, or other health-related factors, but not typically children under six or pregnant women. The FDA, EPA, and CDC regard amalgam fillings as safe for those over six, with no known allergies to the materials.