It is less effective because it is spit out rather than ingested: https://www.researchgate.net/profile/Shou-Hua-Li/publication/19680021_Evaluation_of_the_compar

It is less effective because it is spit out rather than ingested: https://www.researchgate.net/profile/Shou-Hua-Li/publication/19680021_Evaluation_of_the_comparative_effectiveness_of_fluoride_mouthrinsing_fluoride_tablets_and_both_procedures_in_combination_interim_findings_after_two_years/links/53f50dde0cf2888a74916c86/Evaluation-of-the-comparative-effectiveness-of-fluoride-mouthrinsing-fluoride-tablets-and-both-procedures-in-combination-interim-findings-after-two-years.pdf https://www.researchgate.net/profile/Shou-Hua-Li/publication... The most effective treatment was combining fluoride mouth wash and fluoride tablets.