The aim of this study was to evaluate the effectiveness of dental prophylaxis in horses by measuring the fibers in the feces and their importance in animal welfare and health. The results were very satisfactory for each animal's first dental treatment, with an average drop in fecal fiber of 0.58 cm. Thus, we can affirm the effectiveness of dental treatment in horses, generating comfort when feeding and improving intestinal transit, which will consequently reduce gastrointestinal problems.