Benefits end date after a layoff - what worked for you?

I am not sure what date my benefits stop after being let go as a web developer. The letter is unclear about dental and vision. How did you confirm your end date?

I moved my appointments earlier while coverage was active. It saved me a bill.

Thanks for writing this out. I went through something close to it 4 months ago, and it got easier once I kept a simple log of every call and form.