Should a student transfer from studying dentistry to studying human medicine, taking into consideration that human medicine is more beneficial for Muslims and people, but it is more difficult and may lead to exhaustion and loss of determination?

If your current college allows you time to learn religious sciences and perform your religious duties, then continue there. However, if this time is not available to you, then transferring to a human medicine college is better because it is more beneficial to people. You will be rewarded for studying human medicine with the right intention and for benefiting Muslims. Allah will ease your difficulties through the blessing of your intention.