[Jakku]

Create a timer with a loop through all players and check their health, if it's above 90, set it to 90. Like this:

pawn Код:

forward HealthTimer();

//Under OnGameModeInit
SetTimer("HealthTimer",1000,1);

//Somewhere else
public HealthTimer()
{
     for (new i=0;i<MAX_PLAYERS;i++)
     {
          if (IsPlayerConnected(i))
          {
            new Float:health;
            GetPlayerHealth(i, health);
            if (health > 90) SetPlayerHealth(i, 90);
          }
     }
}