Examinations during the Seven Clean Days

Hello, I wanted to ask how essential it is to perform examinations during all seven clean days, aside from one on the first and one on the seventh day and the initial examination. What is the point of doing this if my wife will be pure at the same level and measure? The same question applies to the use of a tight tampon. I would appreciate clear sources besides the fact that it is commendable. Thank you very much,

Hello 

The concepts of "lechatchila" and "bediavad" mean that you have not fulfilled your obligation properly, even if she is pure with a "pass" grade. 

Even a worn-out suit with holes in the elbows is still a suit. But you would never ask, "What's wrong with wearing such a suit — 'bediavad' it's still a suit." 

Shulchan Aruch, Yoreh De'ah, Laws of Niddah, Siman 196, Se'if 4
During each of the seven days of counting, a woman should ideally check twice a day, once in the morning and once close to sunset (Tur in the name of Sefer HaTerumah and Avodat Parashah); if she did not check all seven days but only once, it does not matter whether she checked on the first day of the seven or on the seventh day or on one of the intermediate days, as long as she checked on the day before the seventh and found herself pure, it counts.

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