You've gotten some great replies. To expand on what ahadpour said, use the belt only on lifts close to your 1 rep max (90-92% of your 1 rep max).
If you've been using the belt for all your squats, you'll want to lower the amount of weight you're using during your first few weeks without a belt. Then slowly build back up again. Your trunk will be stronger for it in the long run.
Have a buddy you trust watch your squat from the side and make sure you're not rounding your back at the bottom of the squat.
I've found it's easier to maintain my arch if I regularly stretch my hamstrings, calves and hips. Others have helped their backs by widening their stances and lowering the bar on the shoulders. YMMV.
Pay attention to what Zyg says, if you're getting pain due to straining the spinal ligaments that's not a good thing. Muscle soreness is different than other types of pain.
Also, look at your whole workout. Are you doing deads right before your squats? Did you do deads only a couple of days before? Maybe the back needs more of a break. If squats aren't your first major lift of the day, try making them your first lift.
Most weightlifters and "personal trainers" don't know how to do a proper squat. Learn all you can from reliable sources on proper squatting technique.
Zen
If you've been using the belt for all your squats, you'll want to lower the amount of weight you're using during your first few weeks without a belt. Then slowly build back up again. Your trunk will be stronger for it in the long run.
Have a buddy you trust watch your squat from the side and make sure you're not rounding your back at the bottom of the squat.
I've found it's easier to maintain my arch if I regularly stretch my hamstrings, calves and hips. Others have helped their backs by widening their stances and lowering the bar on the shoulders. YMMV.
Pay attention to what Zyg says, if you're getting pain due to straining the spinal ligaments that's not a good thing. Muscle soreness is different than other types of pain.
Also, look at your whole workout. Are you doing deads right before your squats? Did you do deads only a couple of days before? Maybe the back needs more of a break. If squats aren't your first major lift of the day, try making them your first lift.
Most weightlifters and "personal trainers" don't know how to do a proper squat. Learn all you can from reliable sources on proper squatting technique.
Zen