What do you recommend for tooth whitening if enamel erosion?

Dentist: If enamel erosion is present it is possible you have other dental problems. Dentist should have ideas that will not cause futher problems.

Veneers: Dentin is the tooth structure below enamel, and it is yellowish in color. Thin/eroded enamel may allow more dentin to show through. If this is the case with your teeth, conventional whitening methods may be ineffective. You may need something to "mask" out the dentin showing through the translucent enamel, like porcelain veneers.

Consult needed: You have several options. You could have those eroded areas covered with a lighter bonded composite first and then have your teeth whitened or you could consider porcelain veneers. You may have other options. Only a dentist who can personally clinically examine you will be able to give you the best and most appropriate options and guidance for your particular circumstances.

Don't do it: Whitening only works on enamel. If yours is eroded, you will likely have poor results and may have sensitivity. You need to see your dentist and find out about builoding up your eroded teeth. May need crowns. Would be prudent to see your prosthodontist for evaluation and treatment options.