Universidad Rey Juan Carlos

This study tests whether an 8-week home breathing exercise program using a special device can improve breathing, diaphragm function, and swimming performance in healthy adults who swim regularly. 34 swimmers will be randomly assigned to either the real training or a sham device. …

This study tests whether a 10% carbamide peroxide gel, used at home, can make white spot lesions on teeth less noticeable. About 67 adults with white spots on their front teeth will use the gel and report their satisfaction. The researchers will also check for side effects like t…

This study looks at whether using a soft or rigid tray for at-home tooth whitening with 16% carbamide peroxide makes a difference in how satisfied people are, how white their teeth get, and how much tooth sensitivity or gum irritation they experience. About 100 adults with health…

This study looks at whether the way you take caffeine—capsule, coffee, chewing gum, or mouth rinse—changes how much fat you burn during an hour of cycling. Ten healthy adults who exercise regularly will try each form and a placebo in random order. Researchers will measure fat oxi…