The Oral-B Stages 1 specially designed for babies from 4 to 24 months. When the first tooth comes in — usually between four and six months — it’s time to start brushing. The Oral-B Stages 1 toothbrush makes it easy to gently care for new teeth and tender gums. Warning: For tooth brushing only. Do not chew or bite on brush. Do not use as a toy or without adult supervision. Replace brush every 3 months or sooner if brushhead looks worn.