[Sc0pion]

Fixed!

[Threshold]

pawn Код:

if(dialogid == DIALOG_FOOD)
    {
        if(!response) return 1;
        switch(listitem)
        {
            case 0://Ice Cream
            {
                if(GetPlayerMoney(playerid) < 1) return SendClientMessage(playerid, red, "[ ERROR: You must have $1 to purchase an Ice Cream. ]");
                new Float:hp;
                GetPlayerHealth(playerid, hp);
                SetPlayerHealth(playerid, ((hp + 10.0) >= 100.0) ? (100.0) : (hp + 10.0));
                GivePlayerMoney(playerid, -1);
                SendClientMessage(playerid, COLOR_YELLOW, "[ NOTIFICATION: You have purchased an Ice Cream for $1. ]");
                return 1;
            }
        }
    }

You weren't using GetPlayerHealth before the 'if(hp + 10.0 > 100.0)' line, so hp was equal to 0.