The frequency of replacing the mouthpiece depends primarily on the use. If you use the bottle on a daily basis, replace the spout every 2 or 3 months.
Clean it with special straw brushes.
The Beautamine drinking bottle is designed to be convenient to use and to be ergonomic. Each of its elements is carefully thought out. Also, the mouthpiece only fits the Drinking Bottle product, which means it is not compatible with other bottles.