Caring for the milk teeth helps to have a perfect alignment of the permanent teeth and prevents dental issues from the beginning. Milk teeth help children chew and speak so yes it is necessary to maintain proper hygiene for milk teeth. Milk teeth act as a placeholder for the permanent teeth growing under the gums.
If a child loses milk teeth due to negligence, then (s)he may have problem when the permanent teeth emerge.
The space conflict between teeth can make the teeth crooked or crowded, which could stay on for life. There is an increased chance of cavities spreading faster as the milk teeth have thinner enamel shells.
Hence, it is important to provide babies with good oral care to help protect their teeth for decades to come.