Tooth brushes and razors are cheap.
I ditched all if them at the 4 week mark when I was UND. I ditched them again twice in the next four weeks. Still undetected. I have done the same the last four weeks. I will probably keep it up until the next test, the big one, 12 weeks after treatment.
No particular scientific reason. It just seems sensible to me.
ps: My wife insisted on being tested after I started treatment. She didn't want to risk reinfecting me. What a gal!!!
She was negative for antibodies