What is the lowest amount of max health you can have in Team Fortress 2?

The lowest amount of maximum health a player can have in Team Fortress 2 is 70. This is because the only classes that have less than the default health pool of 125 are the Scout and Engineer. The Scout has a base maximum health of 125, but this can be reduced to 110 when equipped with the Candy Cane melee weapon. On the other hand, the Engineer has a base maximum health of 125, but this can be reduced to 70 when equipped with the Gunslinger melee weapon. Therefore, 70 is the lowest possible maximum health in the game.