Expect the intensity of the behavior to increase before it decreases. Recognize the child as soon as the unacceptable behavior stops . Ignoring must always be combined with supporting and encouraging positive behaviors. Ignoring is difficult. Ignoring does not always render immediate results.
Some parents like to use charts to instill good habits in their children.
You could, for example, use a chart for brushing teeth. Even the child too young to read understands a star. Rewards can be given for the achievement of a certain number of stars. Don't overdo charts. Use them for one behavior at a time.