Bacteria guard bristles. Help keep your brush clean for up to 3 months (Inhibits microbial growth that may affect the bristles. The bristles do not kill the bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use). Battery included. Batter powered toothbrush. www.oralb.com. www.pg.com. Customer Service Number: 1-800-56-OralB (1-800-566-7582). Also try with these Pro-Health products: Crest Pro-Health Toothpaste; Crest Pro-Health Mouth Rinse; Oral-B Glide Pro-Health Floss. Handle made in China. Replacement head made in Germany.