I made a post a while ago about how I was using my gaming desktop (GTX 1080) and laptop (GTX 1060) to mine, and was strongly advised against mining on the laptop. They said, if the fan was at 100% or close it wont last long. I stopped mining on my laptop for a little but now that I found a program that allows you to adjust fan speed on laptops (msi afterburner did not allow me to do so nor did it show the fan speed at all) (the program is called silent option fyi i believe it is only for MSI laptops tho) anyways, Im able to run my gpu at a minimum 67% fan speed while mining and still getting 68-70c temps. Also I will probably sell this laptop soon anyway as I really never use it for gaming (why would I when i have a kickass desktop lol) and id rather get a smaller more battery efficient laptop... and maybe another gpu for my new mining rig with the extra haha. I feel like the laptop will probably be fine for like a couple months max of mining before I get rid of it.
If you really want to continue mining with your laptop, you can buy a laptop fan pad. I use one for my laptop because, like others have said, the dust builds up and suddenly your laptop can't cool itself unless you take it apart to clean out the dust.
Taking apart a laptop to clean the dust is not easy in the slightest. Google any youtube video... it requires taking apart the laptop piece by piece until everything is in pieces. That's how far away the GPU is from the most accessible slots. Then you have to apply thermal paste and a lot of hard work.
If you try to get a guy to clean it for you, it costs as much as a new laptop: $120.
But a laptop pad actually keeps the temperature down by 10 to 20 degrees. I've been able to mine with my laptop using it.
You can also just go full CPU mining with your laptop, which doesn't stress it out as much. Claymore has CPU mining that works with the newer alts out there. There's also an option that does low intensity cpu mining so that it doesn't cause as much heat.