Toilet seat is always coming loose. What can I do?

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Every single toilet seat I have tried loosens up over a short period. I have purchased many different types of toilet seats, wooden, plastic, cushioned over a short period of time. Every one of them wont stay tight in the commode. I most recently had a plumber install a new seat on my toilet and now it is loose. The plumber said there is nothing wrong with the commode itself. I keep a pliers in the bathroom to constantly tighten the seat. The bolts attaching the seat loosen up and the seat shifts sideways and eventually break. Is there a remedy for this?

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