Smile Brite Economy Fixed Head Nylon Soft Toothbrush Soft Nylon Bristles. Economy Toothbrush. STANDARD HEAD economy & value. NO SYNTHETIC BRISTLE DYES reduces chemical load in mouth. ROUNDED BRISTLE TIPS protect tooth enamel. Nylon bristle brushes are the most common type of toothbrushes worldwide. Smile Brite supplies very high quality nylon brushes with full end rounding ad polishing of the bristles; this critical step ensures that there are no rough bristle ends to harm the gums or the enamel. The fixed head line also features an ergonomic ez-grip handle with state of the art design to reach all corners of your mouth easily and effectively. Dentist recommend you replace your toothbrush every 2-3 months for optimum oral care. It is essential to replace your toothbrush immediately if it showes signs of fraying or broken bristles.