PPTP is a network protocol for creating a VPN tunnel. Because of several security vulnerabilities, PPTP is getting obsolete with time. But it does provide excellent speed and is widely used for accessing geo-restricted sites. It is immensely popular, especially among the Windows users.
A VPN Tunnel is a link between two network endpoints which provides encapsulation and encryption for the data flowing through it. This is essentially required to hide your identity as well to secure your data. VPN tunnel requires different vpn protocols like PPTP, L2TP, IPSec etc
Yes, it is safe to swim while you on periods. Period blood doesn't flow outside the vagina like it usually does due to the counter-pressure of the water. But You still need to wear some a tampon or a menstrual cup to avoid getting into a sticky situation.
Resin tooth filling typically contains a filler particle such as quartz, which provides the mixture's strength and color. It is costly as compared to silver tooth filling.
In some cases, the change in period blood color can indicate a health problem like fibroids, low estrogen levels, and even vaginosis.