onCreate() not accessing in SQLiteHelper

I'm novice in Android and I trying to create BD sqlite with API. My class exted SQLiteHelper, the constructor method is OK but the create method not is call. No error in compilation.

MainActivity.java code:

public class MainActivity extends ActionBarActivity {
    private DBTesteHelper dbHelper;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        dbHelper = new DBTesteHelper(this);
        setContentView(R.layout.activity_main);
    }
}

DBTesteHelper.java code:

public class DBTesteHelper extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "bd_teste.db";
private static final int DATABASE_VERSION = 1;


public DBTesteHelper(Context context){
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_TABLE_STUDENT = "CREATE TABLE tb_estudante ("
            + " id INTEGER PRIMARY KEY AUTOINCREMENT ,"
            + " name TEXT, "
            + " idade INTEGER, "
            + " email TEXT )";

    db.execSQL(CREATE_TABLE_STUDENT);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS tb_estudante");
    onCreate(db);
    }
}