When it comes down to it, the only thing that is constant is change. 

A business is either growing or declining. 

Your lungs are either expanding or contracting. 

The universe is either expanding or shrinking. 

If you're not whitening, you're yellowing

There is no 'maintaining.' Change is inevitable. You're either getting better (even if only by a little) or worse (if only by a little). But the paradox is, the amount of energy expended is the same.