After the wall tiles in my kitchen and bathroom were pasted, white hair kept growing from the brick

Agree with the opinion of the first floor, it is cement pan alkali. But if you wait until the cement is dry, you don't estimate how long it will take. If the area is not very large (don't be full of houses, then you will be affected) there is a solution, you can use acidic liquid to wipe the pan alkali clean, and then brush with silicone glue or plugging king (the former chemical store has bought, the back of the home improvement market has) can be solved.

The cement returns to alkali, the wall is not completely dry, and it will no longer produce white hair when it is dry, but pay attention to the wall and floor not to be too wet in the future.