No. Some dents are too deep and are overstretched. Dents the size of a dinner plate or larger can be fixed successfully, as long as they are not too deep. On the other hand, some dents that are as small as a dime but very deep, cannot be fixed using PDR because the metal is too stretched. Cracked paint can also be an indication that a dent is too deep.
Access is important. We need to be able to get behind the dent to perform PDR. If we can access the area behind, we can often massage out the dent with the Paintless Dent Repair process.
The most common dents fixed are the size of a golf ball and under. Most minor dents can be repaired. About 5% of minor dents can't be fixed due to depth or location. Areas such as some quarter panel opening lips, some forward areas of heavily braced hoods, or the very edges of some panels are examples of bad locations.