Soft toothbrushes are widely recommended by dental professionals for several reasons related to oral health and the prevention of damage to teeth and gums:

1. Gentle on Enamel and Gums:

- Soft bristles are less abrasive on both the enamel of the teeth and the soft tissues of the gums. Hard or stiff bristles, on the other hand, can cause wear and tear on the enamel, potentially leading to tooth sensitivity and erosion. They can also cause gum recession by pushing the gums away from the teeth.

2. Effective Cleaning:

- Contrary to what some may believe, soft bristles are very effective at removing plaque and debris from the teeth and along the gum line. They can reach into the crevices between teeth and along the contours of the gums without causing harm.

3. Suitable for Sensitive Teeth:

- People with sensitive teeth or signs of enamel erosion benefit from using soft-bristled toothbrushes as they are less likely to aggravate these conditions.

4. Recommended for Dental Work:

- For those with dental work like braces, veneers, or implants, soft bristles are recommended as they are less likely to cause damage.

Regarding the class action against toothbrush companies, there have been instances in the past where legal actions were taken against manufacturers for the alleged damage caused by hard or firm bristle toothbrushes. These cases typically centered around claims that such toothbrushes led to gum recession, enamel wear, or other forms of dental damage. The outcomes of these legal actions have varied, but they have contributed to a wider awareness of the potential risks associated with hard bristle toothbrushes.

As a result, there has been a shift in the market, with more emphasis on producing and marketing soft-bristled toothbrushes, along with greater educational efforts by dental professionals to inform patients about the best practices in oral hygiene, including the selection of appropriate toothbrushes.

Ultimately, the choice of toothbrush should be based on individual oral health needs, and it’s always a good idea to seek advice from a dental professional regarding the most suitable type of toothbrush for one's specific conditions and requirements.