Why does mouthwash recommend being used after brushing, when it has lower ppm fluoride than toothpaste?

Question

My Listerine mouthwash bottle directions says that for best results use twice a day after brushing. My toothpaste has 1450ppm fluoride, whereas the mouthwash is only 450ppm. Won’t using the mouthwash afterwards simply wash away the higher, more beneficial levels of toothpaste fluoride and replace it with lower mouthwash levels? What’s the reasoning for this advice?

In: Other

Answer 1

My dentist told me to not use mouthwash after brushing , or rinse with water as it washes away the toothpaste.

Just brush and spit the excess and not rinse for 30 minutes to let the toothpaste do its thing.

Use mouthwash only when you cannot brush your teeth.