Final answer:
Using waxed dental floss before topical application of fluoride can reduce the effectiveness of fluoride in protecting the teeth.
Step-by-step explanation:
An undesirable result of using waxed dental floss before topical application of fluoride is that the wax on the floss can create a barrier on the surface of the teeth, preventing the fluoride from effectively reaching the tooth enamel.
Fluoride is commonly used to strengthen tooth enamel and prevent tooth decay. It works by remineralizing the teeth and making them more resistant to acid attacks from plaque bacteria. However, the wax on the dental floss can interfere with the absorption of fluoride, reducing its effectiveness in protecting the teeth.
To ensure optimal benefits from fluoride, it is recommended to floss before applying topical fluoride, preferably with unwaxed dental floss.