Can silicone interdental pick cause black triangle between teeth? i ask this because when i started to use them, it hardly went in my front teeth as there was no gap but now it can go in and can see a little black triangle. could i have caused damage?

You've asked so many questions regarding these embrasures. The picks themselves would caused no damage. I you misused them and used frequent, excessive force, there may be a slight contributing factor. Bone loss is the usual cause and I'm confident by this time you have the answer to that question.

OVER USE OR TOO MUCH FORCE OR PRESSURE COULD CAUSE A TRIANGLE OR BONE LOSS FROM POOR ORAL HYGIENE. SEE YOUR DENTIST FOR A CONSULTATION.