You
brush your teeth after every meal, if possible.
shouldn't
mustn't
must
should

You should brush your teeth after every meal, if possible

Explanation:

If possible is a conditional statement/phrase and therefore should will follow it

should

Explanation:

we use should for giving some sort of advice and the above statement is a type of advice

ichabod crane is a fictional character and the protagonist in washington irving's short story, "the legend of sleepy hollow", first published in 1820. in popular culture, this story is sometimes retitled as "the headless horseman."

the answer is true.

the international phonetic alphabet (a standardized system of phonetic symbols devised and maintained by the international phonetic association) is composed of one or more elements of two basic types, letters and diacritics.