Surely many people brew the same tea bag several times without even thinking about whether it is possible to do so.
Some people try to save money this way, because as a result they can drink tea more often and spend less money on the drink.
Others find the first cup of tea too sweet, so they reuse the tea leaves.
Despite the fact that this habit is quite widespread and even somewhat established, it should not be done this way.
The point is that the tea bag will simply become dangerous to your health. The risk that the drink will become a source of microbes that will not have the best effect on the body is too high.
However, you can brew two cups at once using one tea bag: there is nothing harmful or dangerous in such a habit. But such a system is only suitable for strong brewing, otherwise instead of two cups of tea you will get hot colored water.
Instead of brewing the tea bag several times, you can dry it and use it to neutralize unpleasant odors in your apartment.