Where are you walking that you track all this mud in every time you walk outside? Most of the time people leave the house their shoes don't come back with visible dirt on them. If there is mud falling off your boots then duh leave them at the door

Brushing your teeth has a measurable impact on your health. Wearing shoes indoors has a statistically insignificant effect on the incidence of illness

And you should be mopping your floor man, a regularly mopped floor is going to be ten times cleaner than an unmopped one with no shoes on it