However, most CPUs and mainboards manufactured in the last 5-10 years have built-in alarm systems. USually they automatically sound a continuos and pretty loud alarm over the internal speaker once CPU temperature hits a preset danger treshold.
Most mainboards even go a step further: Should temperature not decrease shortly or if temperature rises even higher to the next threshold, the computer will be shutdown "hard", instantly relieving any CPU overload.
Additionaly, all CPUs are delivered boxed, which means with a fan/cooler pack. Those usually suck (they get VERY loud during load), but they are obviously sufficient to cover even maximum CPU load. To avoid noise and heat it still is recommended to switch to an alternative CPU cooler. There are plenty available, and especially the big fat ones (with a big cooler block and large fan(s)) are always a good idea. A large cooler block helps transport heat away without the need of additional airflow, reducing noise. A large fan (usually 12 or 14cm instead of the 6 or 8cm the boxed ones have) in addition is a good choice, because it can transport A LOT more air with a single rotation than a smaller one. It's simple circle math. A circle with a radius of 12cm has 450cm² whereas a 8cm fan only has 200cm². The actual difference is even bigger, because the socket in the centre has about the same size on the small as one the big one, plus the blades are wider. This means rotation speed reduces a lot for the same amount of air being transported, and a low rotation speed means low noise levels. And a good fan only costs 30-40€ and is a long-term investition, considering that you can transport them over to your next upgrades of your PC.
Everest is a good tool to monitor and test some stuff, but monitoring your CPU temp is not really necessary. If you have heat issues, there's a simple solution: Open your case and CLEAN your computer innards. They probably are filled with dust and dirt. Best method is compressed air. Get outside and use a compressor (if you have one) or go for the cheap canned compressed air. It's perfect to blow the dust out of the cooler blocks.