Hi and thank you for your question! We usually recommend allowing 6-8 weeks between laser hair removal treatment sessions to ensure there are enough actively growing hair follicles for the laser to target. Doing laser too early runs the risk of not having enough active follicles which might reduce the effectiveness of the treatment. In rare cases and areas such as face where the hair growth is faster, it might be possible to do it a little bit earlier than 6 weeks but 4 weeks is a bit too short. By the way, shaving the hair generally has no impact on making it thicker or grow faster. It’s just the blunt tip of the hair that emerges from the skin and gives it the impression that hair is ticker. I hope it helps and good luck!
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