My laptop reaches CPU temperatures of around 75 C sometimes, Is this dangerous?

75c is a bit high... 50 - 60c is average. id either invest in a bigger fan or use a can of air and try to clean it. You can also take it to a local shop and have them open it, and apply some thermal grease to the cpu. One of your system fans may not be working. Look on the net for a "fan temp monitor" program. A lot of these will report issues back, or allow you to control the fan speed manually.