Mechanic here. I aggree with RurouniRinku answer, but as for your second question. Yes you should a 100% get them looked at or replaced! Also if you notice some threads getting loose in the fabric of the belt, the structural integrity is compramized and needs to be replaced or it could snap, when you need it to hold.
You can also notice in older cars when you loosen the seatbelt and it does not retract all the way, those ones I would also replace.
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