Laptops run hotter overall when compared to a desktop and as a result are made to withstand such temperatures on a daily basis. My GPU on my desktop runs at at around 71 degrees under load and my CPU at around 60 degrees, and keep in my I have additional fans mounted in the case. A friend who uses a laptop routinely sees temperatures go up to 80 degrees on his GPU.
You have to keep in mind that all those components are tightly packed inside, so temperatures like that are to be expected. The only reason to worry about it is if they start going even higher. 90 degrees I say should be the limit on the GPU. And besides, laptops have safety measures built-in. If the temperatures far higher than they should, it starts to throttle the components to cool everything down. Worst case scenario, if the temperatures get critical, it will simply shut down when the sensors detect it. I had a friend who used a laptop for around 3 years and for the first 2 he didn't bother cleaning the dust, running it at close to 90 degrees sometimes. But that laptop is still alive and kicking.