Is the tretinoin still effective if the cap were left open for 24 hours? Or shold I buy new one?

The cap of my tretinoin was damage that is was cut into half due to the tightness and the force I put into it.The problem is it occured after I put my tretinoin on and it left my tretinoin open for the last 24 hours without me knowing it. I also notice that the consistency of the cream was changed and that I can feel a different reaction on my face every morning compared to those days were the cap wasn't damage, though I've already fix the cap. Please help. Thank you

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