Manual Toothbrush Design for Adults

I'm looking for a designer to create a manual toothbrush specifically for adults. The design should incorporate the following features:

- Soft bristles for gentle cleaning
- Ergonomic handle for comfortable grip
- Interdental cleaners for thorough plaque removal

Ideal candidates should have experience in product design, particularly in the personal care or dental hygiene industry. Familiarity with ergonomic design principles and an understanding of adult consumer preferences would be a plus. Please include any relevant work in your bids.