A beauty blender is a versatile tool that can be used to apply foundation, concealer, powder, and even contour. When it comes to how often you should buy a new one, it really depends on how often you use it and how well you take care of it.
If you use your beauty blender every day, then you'll probably need to replace it every 1-2 months. However, if you only use it once in awhile or if you're very careful with it, then it could last 6 months or even longer.
When it's time for a new beauty blender, look for one that's made of high-quality materials and that has a smooth texture. Avoid any that are too firm or have visible seams as these can be difficult to work with and may cause streaks.