Contact problem?

I lost one of my contacts so i put in a new one in my right eye. I lately found the old one. What should I do because the "old" pair was individual a week old and I wear monthly contacts? I give best answer
if they are only monthly next they will only last a month....once contact lenses are opened they start to deteriorate so its not advisible to wear them longer than what they are ment to closing for....i learnt this the hard way when i used contact lenses that be over a month old (one split in half contained by my eye).

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