Neither. 1m is really short while 25 dm is absurdly tall.
There are people with those heights but they are exceptions.
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dm and dm refer to the same unit, decimetres. Therefore, 25 dm is equal to 25 dm (decimetres). Another, similar unit, the decametre, is abbreviated dam.
2.5 dm
25 dm
The length of a tissue box is most likely 25 cm. 25 m, or meters, would be far to large. One meter is about the length of a yard. 25 dm, ordecimeter's would also be wrong. There are ten decimeters in one meter. Therefore, 25 decimeters would be longer than 2.5 meters, which is much longer than a tissue box.
The height of a human is usually measured in cm.