Matt Roach's page

No, according to the actual rules, it only adds to your existing score. But you could change it if you wanted to. But then anyone could use it and abuse it.

Alright, the text is confusing in that it says the bonus is temporary until the belt is worn for 24 hours.

Am I correct in assuming that the Belts of Giant's Strength, Incredible Dexterity, and Mighty Constitution make their ability score increases permanent after having been worn for a 24-hour period? Because that is what the rules as written seem to imply.