How many baby teeth do you have to loose and How many baby teeth do you have left depends on how old are you! In all cases, as soon as teeth begin to appear in your baby’s mouth, you should purchase an infant toothbrush. You must brush the teeth and gums gently in the morning and before getting him to sleep. Make your child used to not eating anything (except for water) after you getting him brushed in the evening. avoid using toothpaste for your child or baby. Just make him feel comfortable with the brushing routine. That will form him a healthy dental lifestyle. Don’t forget to see a pediatric dentist twice a year.