Final answer:
Light therapy is used for acne treatment, wound healing, and infantile jaundice treatment but not for teeth whitening. UV light aids in molecule alteration for therapeutic uses, but teeth whitening utilizes different methods.
Step-by-step explanation:
Light therapy, the application of light rays to the skin, is used for a variety of treatments. Popular uses of light therapy include acne treatment, aiding in wound healing, and promoting the production of vitamin D. UV light, in particular, has the energy capable of altering molecules in ways that visible light cannot. For instance, ultraviolet (UV) rays are beneficial for treating conditions such as infantile jaundice by reducing the levels of bilirubin in the blood.
While UV light is also used in the sterilization of equipment and killing germs, it does not have applications in teeth whitening. Teeth whitening procedures typically use other forms of light or chemical agents to remove stains from teeth. Therefore, the correct answer to the question is D) Teeth whitening, as light therapy is not used for this purpose.